Cached Exchange Mode enables a better experience when you use an Exchange account. In this mode, a copy of your mailbox is saved on your computer. This copy provides quick access to your data, and it is frequently updated with the server that runs Microsoft Exchange. If you're a Microsoft subscriber with semi-annual updates, under Offline Settings , check Use Cached Exchange Mode to download email to an Outlook data file.
By default, 12 months of your email is available offline, but you can control how much mail is kept offline. By default, when Cached Exchange Mode is turned on, a local copy of shared folders is downloaded to your computer. To change whether shared folders or Public Folders are downloaded when Cached Exchange Mode is turned on, do the following:. An Exchange account doesn't exist in your Microsoft Outlook profile This feature requires your Outlook profile contain an Exchange account.
Your Exchange server administrator has disabled this functionality Exchange administrators can disable this feature in Outlook. For more information, contact your Exchange administrator. Note: Cached Exchange Mode is the default when you add an Exchange account. Click Account Settings , and then click Account Settings.
On the E-mail tab, click the Exchange account, and then click Change. When you are using Cached Exchange Mode, an email message may remain in the Outbox for up to one minute until the next synchronization with the server that runs Exchange occurs.
If you want to send the message immediately, do the following:. Cached Exchange Mode can automatically optimize data transmissions for the connection speed to the server that runs Exchange. However, you can manually change the download preferences. Download Full Items This is the default setting. All messages and attachments are downloaded. Download Headers and Then Full Items After message headers are downloaded, downloading of message bodies and attachments begins.
When downloading a large amount of items, this setting is useful so you can see message headers quickly and then choose a message to open without first waiting for all messages to be downloaded in their entirety. Download Headers No message bodies or attachments are downloaded. This reduces the data transfer amount and connection time. When you open an item, the full item is then downloaded from the mail server.
On Slow Connections Download Headers Only When a slow connection is detected, message bodies and attachments are not downloaded. Since adding multiple mailboxes does not break Outlook's ability to sync under normal circumstances, there is something else amiss here.
The most likely scenario is that you have exceeded the maxiumum number of open server objects for this MAPI client. The easiest way to check for this is to look for events in the application event log on the Exchange Server. In Outlook cached mode when you add additional mailboxes, by default the shared non-mail folders are cached.
If your users are caching shared folders, this could be exhausting the server objects limit. In addition, client add-ins sometimes contribute to the problem by holding objects open.
Also check the Sync Issues folder on the client to see if a problem is reported there. This folder is only visible in the Folder List view.
Thank you very much for your assistance. I reviewed our Exchange server's application logs and did find the events listed for the clients which experienced this issue. I am currently reviewing 3rd party add-ins in Outlook to see if one may be at fault and will update later with the results. I reviewed the 3rd party add-ins in Outlook and the problem persisted with all of them disabled even the native Outlook and Exchange add-ins disabled , so it doesn't appear to be an issue with an add-in holding objects open.
I would like to elaborate a bit on the Outlook client configuration to see if you might have any suggestions other than the registry hacks mentioned in the TechNet article you referenced:. We are not caching the additional mailboxes, just keeping them in online view.
The only cached mailbox is the main one, nothing else is cached. Everything works smoothly for Outlook clients, it is just Outlook clients that have the issue. Any further suggestions? Any way to view which or how many server objects an Outlook clients has open and what resources these relate to? We are also experiencing the same issue as John.
Is there any other fix beside the registry hacks mentioned in the TechNet article you referenced? It sounds potentially dangerous to make that alteration Incorrectly configuring this value could lead to out-of-memory warnings or virtual memory fragmentation warnings. Clients are running Outlook There are several users with this problem. When the error occurs on the mailbox server, the user does not 'receive' mail anymore in Outlook running in Cached Mode.
OWA does show the mail. I tested with one user by disconnecting extra mailboxes, so only the user mailbox and online archive mailbox are in use. Office , Office Still have not found a solution, setup their mail accounts on 3 different known working computers, same problem Doesn't make a difference of how much offline cache in the OST is downloaded.
The 2nd user has access to her managers mailbox, her managers mailbox inbox downloads and updates fine in the same mail profile in Outlook, it is only the user's inbox that stops downloading in Outlook.
OWA reflects the inbox properly. Outlook without cache works fine as well Online mode. We do not want to use Online mode because when the user changes to different folders it is very slow because it is not using cache, so this would not be a permanent solution but rather a workaround.
We're experiencing similar issues. However, doing a ping to our cas array public I can see packets being dropped and huge spikes. It's something I'm currently working on with networking. 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.
Messages can become stuck in the pipeline due to unexpected conflicts or corrupt data. Start Outlook using the following command-line select Start and then select Run :. To use this switch you need at least Office Service Pack 2 installed for Outlook Later versions of Outlook have this functionality built into the product. Usually when things work as expected in Outlook, new messages that are synchronized into the mailbox are temporarily hidden so they can be processed by the ItemProcSearch search folder.
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