It means that the Cached Exchange Mode is enabled. A user cannot open an inaccessible file in Outlook application. Your email address will not be published. Read More. Home Products Offers Contact. What is Cached Exchange Mode in Outlook? Aftab Alam Updated On - 22 Feb A user can make changes in the mailbox like accessing emails and saving drafts even when the Internet is down.
It is useful for high latency connections. Searching files and information is quite easy in offline storage OST files. In satellite and radio-frequency based connections, OST file works much better than the online files. An index can be prepared by searching content locally in cached mode. In Cached Exchange Mode, you cannot perform searching in emails. Here are some examples: Some of the messages may be stored only in the OST file and will not be available in the Exchange mailbox.
Some important information like calendar items will point to the local files rather than the Server files; so it is difficult to share the calendar entries in the cached mode If you enable the cached mode to an existing mailbox that already has large amount of data, that may create downloading issues. The response time for the identification of the corruption issue in the mailbox may take more time.
If the OST file that has been created after enabling the Exchange Mode becomes corrupt, then all its data will be lost before connecting with the Exchange Server. Also, if the OST file gets disassociated with the account, then all information saved in it will be lost.
Select the Exchange Account and click Change. Restart the Outlook application again. Enable Cached mode in Outlook The user can turn on the cached mode in Outlook using the following steps- Click File in the top menu bar. When an Exchange account in Outlook is configured to use Cached Exchange Mode, Outlook works from a local copy of the user's Exchange mailbox that is stored in an offline data file. Cached Exchange Mode's purpose is to provide a seamless online and offline Outlook experience.
It's also designed to help insulate users from network latency and connectivity issues while they are using Outlook. By caching users' mailboxes to their computers, Outlook no longer depends on continuous network connectivity for access to user information.
It also reduces network load. After messages have been pulled over the network one time, subsequent access to those messages does not cause additional network traffic. Any email messages the user drafted while offline are automatically sent when that user is back online. When the user is online, the cached mailbox and OAB are periodically updated from the Exchange Server in the background.
While Cached Exchange Mode is the default and recommended mode, there are some known issues with this mode, including synchronization delays with shared items and address book updates; see Known issues with Cached Exchange Mode. The second type of Exchange connection mode is Online Mode. Online Mode works by using information directly from the server; as the name implies, it requires a connection.
Mailbox data is only cached in memory and never written to disk. For more details, see Turn on Cached Exchange Mode. Shared mail folder caching can also be disabled using the Office Customization Tool OCT or Group Policy; see Shared mail folders are downloaded in Cached mode by default in Outlook and later versions.
The email folders for these mailboxes may show item counts that are lower than expected. Additionally, older items seem to be missing, and you receive the following message at the bottom of the list of items:. Click here to view more on Microsoft Exchange. This behavior occurs because the Cached Exchange mode Mail to keep offline setting is configured to a value other than All. In the default configuration, depending on the size of your hard disk, Outlook synchronizes only 1, 3, or 12 months of email to your offline data.
This setting does not affect the number of items that are synchronized with folders of the following types:. For more, see Only a subset of your Exchange mailbox items are synchronized in Outlook. When you use Cached Exchange Mode or an Outlook data.
This problem may occur if you have folders that exceed the limit for the number of items per folder or if you have too many folders total. The item and folder limits depend on the version of Outlook, as follows. If you have folders that exceed the limit for the number of items in an Outlook data. This is document adni in the Knowledge Base.
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In such cases, you need to assistance of professional software. It can recover the data, provide the preview, filter the recovered data, and save it in multiple formats including the PST file. Cached Exchange Mode is perfectly suitable for Exchange Server users. It saves a local copy of your online mailbox to your computer. Follow the simple procedure here —.
In the Cached Exchange Mode, the user gets the Download preferences to download mailbox data in different situations. If there is no Cached Exchange Mode option in your Outlook application, then there can be following reasons behind this scenario —. Verifying the status of Cached Exchange Mode is quite easy to check. Look at the bottom of the right-hand side of Outlook application, it should say Connected to Microsoft Exchange , and an OST file is present in the computer. It means that the Cached Exchange Mode is enabled.
A user cannot open an inaccessible file in Outlook application. Your email address will not be published. Read More. Home Products Offers Contact. What is Cached Exchange Mode in Outlook? Aftab Alam Updated On - 22 Feb A user can make changes in the mailbox like accessing emails and saving drafts even when the Internet is down. It is useful for high latency connections. Searching files and information is quite easy in offline storage OST files. In satellite and radio-frequency based connections, OST file works much better than the online files.
An index can be prepared by searching content locally in cached mode. If you have folders that exceed the limit for the number of items in an Outlook data. This is document adni in the Knowledge Base. Last modified on Skip to: content search login.
Knowledge Base Search. Log in. Options Help Chat with a consultant. Include archived documents. Outlook for Mac desktop versions including support only Cached Exchange Mode. Issue Description Resolution Synchronization delays and issues with shared mailboxes, including shared calendars and mail folders.
By default, if an Outlook profile is configured with an Exchange account using Cached Exchange Mode and you add an additional Exchange mailbox to the profile, all items in all the folders to which you have access in the additional mailbox are downloaded to your offline Outlook data. You can disable caching of additional mailboxes by following these steps: In Outlook, open the Account Settings window. Select the primary Exchange account, and click the Change button.
Click the More Settings Click the Advanced tab, and uncheck Download shared folders. Outlook for Mac versions experience synchronization delays with shared folders and calendar items. Because the clients operate in this mode, this sometimes causes synchronization delays between the client and the Exchange server.
For Outlook for Mac, you can try to resolve the issue by resetting the cache for the unsynchronized folder or calendar; see Clear the cache in Outlook for Mac. Only a subset of your Exchange mailbox items are synchronized in Outlook or Outlook This setting does not affect the number of items that are synchronized with folders of the following types: Calendar Contacts Tasks Journal Notes Outbox Shared or delegated only for Outlook For more, see Only a subset of your Exchange mailbox items are synchronized in Outlook.
Performance issues when there are too many items or folders in a Cached mode offline data. Folders are not displayed correctly, or they take a long time to appear, especially in Cached Exchange Mode. Outlook , Outlook , and Outlook , items per folder folders total If you have folders that exceed the limit for the number of items in an Outlook data.
When you are using Cached Exchange Mode, a message may remain in the Outbox for up to one minute until the next synchronization with the Exchange server occurs. Contact us. Synchronization delays and issues with shared mailboxes, including shared calendars and mail folders.
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Please start a New Thread if you're having a similar issue. View our Welcome Guide to learn how to use this site. AndyBern Thread Starter. Joined Jun 7, Messages When use Outlook to get my email, a short message appears saying it is updating cached headers. I have no problem with this, except it says there are over cached headers to update, and my IMAP folders only contains about 32 emails total.
Where are all these cached headers stored? In Outlook? On the server? Is there a way to clear them out? I solved the problem with the cached headers updates: My IMAP store has about kb of message content. The local pst folder should contain no more than this. Having the same issue. Windows 7, Outlook affects a handful of my users, not sure why some and not others. Aside from the countless examples of this issue online, I've got a couple of friends in IT experiencing the same problem with some of their users.
Considering how many people are having this issue and how long it's been going on, kinda blows my mind that there is no explanation or fix for this by now I Think i found a solution for that. The Reason for this behavior is that you have a corrupted mail in your Mailbox. When the move dialog appears you can select skip corruped mails. Thanks for your post. I'll keep this in my back pocket, but creating an entirely new EDB for affected users seems a bit drastic, at least without more definitive information about the cause of the problem.
In addition, at least in my case, I have noticed that the issue seems to be confined to users who are opening one or more other user's mailboxes in addition to their own. Still working to confirm this, but if the theory pans out it may not have anything to do with the actual user's maibox at all. Still, the idea of mailbox corruption is interesting. Might try doing a New-MailboxRepairRequest on an affected user's mailbox as a test.
We are seeing a similar issue as well. Running Exchange latest CU. Outlook clients through Again, all 3 with issues seem to open other mailboxes and we have tried moving them from Outlook to Nothing seems to correct it, but if we have the user use OWA, then everything works fine as expected. Even after removing the alternate mailboxes they open, they still have the issue.
Changing from cached mode to only live, also seems to resolve or workaround the issue. Would be interested if anyone else has found any other updates or workarounds on this issue. I'm looking at trying either the EDB migration test or the mailboxrepairrequest if no one else has anything better yet Thank you for providing this update. I hadn't gotten round to trying the EDB migration or mailbox repair, and now based on your experience I don't think I'll bother.
This has got to be something with Outlook, and specifically, how it caches. If there was an issue with the mailbox itself you'd expect to have a problem when accessing it via OWA, but I've seen no reports of that. Luckily this has mainly been a nuisance issue, but it sure would be nice if the company that made the software would offer an explanation and resolution.
I managed to solve my problem by "compacting" my ost file. Thank you for your post. Just curious as to whether the caching issue recurred several days after compacting the OST file? I admit to being skeptical because I've tried renaming the old OST and starting fresh with a new one but that did not solve the problem-- at least, not for very long. But I have just tried compacting the OST and re-enabling cached mode to see whether the "fix" sticks It's a good thing Microsoft don't make cars because they would be killing people every time someone tried to turn the steering wheel and it broke off C'mon Microsoft, this is one of your flagship programs.
I finally got my Windows 10 to load the upgrade and found this bug straight away. I have Outlook upgraded from perhaps , running on Windows 10 Pro, upgraded from W7 Ultimate, Host is a Dell T yes server platform with just W10 software on.
Once the last mail is deleted status bar shows Inbox and Deletd mail folders synchronizing and then the new mail pops up. That fixed it for me. For the last few weeks we have had the same problem. Certain people in the organization in cached mode have this problem.
I have been searching the forums to see if it was a recent bad patch, but i think this issue is too broad to find good info similar to searching "my car won't start", there are many reasons for that not necessarily related I would also submit for all you who are frusterated, that this is why microsoft has not "fixed" it.
There are too many different reasons this may occur. Usually for us, prior to one month ago, this was only happening when users had clicked the "offline" button in their outlook. Or at worst, i would have to rebuild the mail profile and redownload. The resolution is to have the user restart their outlook. I have had some success with reimaging the machine worked for one user today , however rebuilding just the profile does not work.
This is very annoying as we are deploying this version right now and it's sporadic. Difficult to explain to management who won't accept "Microsoft won't acknowledge a problem. I was sort of glad to find this thread; I am not alone with this weird but annoying issue. I too have problems with Outlook in cached mode not syncing with the Exchange server. Without caching it does function properly but performance and delays become an issue.
At first my new install HP Probook, Win10, Office worked as it should, but the syncing issue popped up early last December. And it seemed to have cleared the issue. Until recently it seemed to work, then also this 'trick' didn't do it anymore I also switched off all firewall rules to prevent from anything being filtered, switched off AV I also suspected the address book downloads, but I couldn't find anything related to that or how to resolve it.
Is someone at Microsoft aware of this problem, which seems to impact more people than I expected? The issue on our side only appear when users are not connected to our corporate network and have more than 2 mailboxes mounted.
The behavior is simple. I looked every logs possible in Exchange and can't find anything relevant. It just stop working without a valid reason. Don't understand why Microsoft does not communicate about this issue as it seems to be reproducable in several environment.
The only thing I can think of is an issue with the OAB, as I have the message below in the "outlook connection status" box under "local mailbox" field :. Force the reconnect in "connection status" remove all attempts to download the OAB and remove the problem. I also make sure that I have the correct permission to reach the OAB and when I browse it I successfully end up on the XML configuration page so neither a permission issue.
I honestly does not have any clue anymore and can't just disable the cache mode to solve this, we need a permanent solution here. Upgrade to Exchange CU19 has not been tested yet as we have many other third parties application which prevent to do so. Update : I do have a log in our Cas server : [Eas] The number of outstanding requests for guard TargetBackend "server-name.
I checked and logs error was already there before users started to get this sync issue so dont believe this is related. I did not tried yet to increase the limit in the Webconfig as it is something which can easily mess up Exchange. FYI, I've added the registry keys indicated in this article and so far the issue seems to be gone. Wanted to throw my hat in the ring here. Many but not all people in my organization are having this issue.
Here's the kicker for me. At work, I use Office on Windows 10 with on-prem Exchange Probably about twice a day I realize I haven't gotten email for an hour and have to restart my Outlook to get it syncing again. Our internal IT department thinks it's a problem with the Exchange environment but here's the kicker, I use the Outlook desktop app at home with a single IMAP account loaded in and I have the same exact issue.
It just randomly decides not to update and a restart of the app is the only fix. Everything works fine for an unspecified amount of time before it randomly stops updating. Absolutely nothing is logged in the event logs. I've even taken a screenshot of this screen shortly after Outlook launch, then compared it to what it looked like 6 hours later when I noticed Outlook had stopped updating, but there isn't much changed.
While in this Connection Status dialog, if I click "Reconnect", then it will actually update my inbox immediately. Here's the kicker Restarting Outlook is the only way to fully fix this problem, albeit temporarily. We are having this issue in our environment as well for a handful of users. Overall, just strangeness with cached mode. Outlook won't update unless it's Online, another user can't send mail unless she's online, calendars aren't updating unless they are online, etc.
First Microsoft had told me it had to do with the size of the Inbox folder. At the time it was around 6GB and they told me the folder itself had to be less than 4GB to load in cached mode. I was able to find plenty of examples where other user's mailboxes were over 4GB and loading fine. Some of those user's had 30GB of data in their mailboxes, whereas this particular person only has about 10GB.
None of these things resolved the issue. I saw someone in here mention corrupt mail as a possibility and that sounds plausible, though I'm not sure how I can locate and combat that. I am also seeing this behavior for one or two of my staff. We have tried resetting outlook profile, but problem still persists.
I am with you on this, i have many users with exactly the same problem and the best microsoft have been able to offer is as follows. Check the Application Logs on your Exchange server. Look for Event ID If you're seeing that event, it's likely that user or users have exceeded the maximum number of MAPI connections to the Information Store. It's an easy fix by editing a registry key on the exchange server then stopping and restarting the Information Store.
Here's the link to the Microsoft article with all the information you need. I believe in O the hard limit is per session so the user and any cached shared mailboxes. There are other session limits though, so it is possible one of those session limits is being hit.
Exchange on-prem you can. There are some other reasons you could be hitting session limits, aside from actually exceeding the limits under normal operation. Thinking about it, I have once seen the firewall one mentioned above, years and years ago. It was a real pain to find. If there are 2 users, have you tried running them on a different machine on a different network? Do they still get the same issue? Microsoft support said move all the emails from inbox to another folder but i don't believe what they said cause they are keep saying very strange things to solve the issue.
I only see this issue where our staff have another user's mailbox mapped. I always as a matter of course untick the Download shared folders box in Advanced settings, when setting up a new user. If this isn't done, all I can do is create a new profile and ensure this is unticked at the time, so pushing out the reg key to the 'Policies' hive may well work as a fix. I'm a user with multiple additional mailboxes in Exchange running Outlook and encountered this frustrating issue.
Means I can't update my shared mailboxes for now, but resolves the issue while I get some of the no-longer-required mailboxes are removed. Any luck, that works given discussions above around mailbox size and folder limits. I see you had the same issue I am experiencing now. We have Exchange on premise with some Outlook clients running cached mode. Some e-mails doesn't sync to these clients unless Outlook is restarted.
Did you find the reason? This has been covered in another thread, when utilizing exchange server to grant permission between mailboxes for example: secretary needs access to president's mailbox so she can respond or manage calendar appointments for him, sync will stop working for her mailbox and it would seem the only option is to remove option to use mailbox in cached mode. I've tried and tested successfully on multiple users.
For newbies, here's some instructions on where the folder you want to delete resides and how to do this:. Open Outlook and mail works and synchronises - don't worry users still have working autofills Then write a. This may work for some, but not for me.. New profile, new machine, nothing changes the cached items. The only time i have 'fixed' the issue was when I started outlook online no caching pst'd the users calendar, then I removed all SERVER calendar items.
Went back into cache mode, then imported all of his calendar items.. Well unfortunately got to the bottom of reading this link ,and as of July problem still exists. My story is tried to upgrade from Office to , main reason was emails taking too long to come into my inbox and it all seemed a bit sluggish. Hence a Sunday afternoon project turned into a evening of pain. We had the same issue in our office which caused a massive headache for our IT team and many users who have shared mailboxes that were syncing.
We went through all the steps in various pages. A few years ago, someone created a public folder mailbox for testing purposes which was not being used. It appeared that Outlook was not loading the shared mailbox as it was waiting to get a connection to the Public Folder Mailbox.
During the mailbox move I noticed it mentioned that my mailbox had folders. I actually see about 75 or so folders in Outlook. I know that Outlook cached mode has issues with more than folders. Set it to Online and No Cache mode. Found a folder called "ExchangeSyncData" with tons of folders and subfolders for mostly old and a few current ActiveSync devices.
Hard deleted the entire folder and now Outlook can sync Inbox automatically. I did have to remove and re-add my mail account on all of my iOS devices as they went haywire afterwards. But that's a small price to pay assuming it stays fixed. Office Office Exchange Server. Not an IT pro? Internet Explorer TechCenter. Sign in. United States English. Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:.
Archived Forums. Outlook IT Pro Discussions. This forum is for general questions and feedback related to Outlook all versions as they pertain to the IT Pro community. Sign in to vote. Completely delete and recreate the Outlook profile Disable Outlook add-ins Start Outlook in safe mode outlook.
Wednesday, April 27, PM. If you have feedback for TechNet Support, contact tnmff microsoft. Thursday, April 28, PM. How do you define "too large" for an OST file? Tuesday, July 5, PM. It could be happen that your exchange admin might have set max size for the MB. Wednesday, November 9, AM. Hi I have actually the same issue with Outlook clients on Exchange Monday, November 14, PM.
OST file sizes are determined by the version of Outlook you are using. However, you can make changes to the registry: How to configure the size limit for both. Thursday, November 17, AM. Same exact problem here, though I've only seen it with some Outlook clients. Never seen anything like it before and no idea what could be going on. I'm thinking of trying to install the latest CU for my server which is CU Friday, January 13, PM. Hi, Did installing CU13 help?
Our is on CU10 and some users are facing the same issue. Thursday, March 9, AM. Hi: CU13 seems to have helped but we still have intermittent instances with this. Any thoughts? Thursday, March 23, PM. Wednesday, March 29, AM. I still have this issue and I have tried all the recommended 'fixes', I have also tried Outlook , Outlook and now happening with Still using Exchange which is fully patched.
Thursday, March 30, AM. I have also tried all of the above, but the issue still persists. I use Office for business. Tuesday, June 6, AM. Yep, I am seeing this too. Everything completely up-to-date and patched, only this problem. Works fine in online mode. Microsoft, please focus on fixing bugs, it will be much more appreciated than features at this point. Tuesday, June 6, PM. Seeing the same issue here on a handful of users.
Monday, July 10, PM. Monday, July 17, AM. I also have the same issue. It is on an exec's mailbox. Not sure if the issue is related to the volume of email he has since most other users have a lot less. Monday, July 17, PM. We have just created a new mailbox for my user, her mailbox was clean, only a few mails and still the same problem so it definitely is not size related.
However in your case I don't know what your bandwidth is like, here in South Africa 20GB OST would be a killer size to download especially since we have no datacenter on the continent. Tuesday, July 18, PM. I'm wondering if anyone has resolved their issue regarding this if it isn't networking. Edited by senkosal Wednesday, July 19, PM typo. Wednesday, July 19, PM.
I don't think anyone has resolved this. I've seen it happen on the same LAN with no firewalls in between. Microsoft needs to acknowledge it before any progress is made I guess. Disabling cached mode is how I'm dealing with it right now. Don't know what else to do. Wednesday, July 26, PM. Same here. About 3 out of All procedures didn't help, upgrading from to helped one user, not the others. Thursday, July 27, AM.
This works fine in my case. Edited by holber Friday, July 28, AM. Friday, July 28, AM. Friday, July 28, PM.