Cached Exchange Mode is new in Outlook 2003. If makes a local copy of the Exchange Mailbox. The benefits of enabling this is reducing network traffic, faster responds time of the Outlook client (especially with large attachments), being able to use the Junk E-mail Filter and being able to work off-line. Enable this feature as you configure the email accounts in Outlook. Keep the mail on the server. Also, take advantage of Office 365's Online Archive feature, which works with Outlook 2016. Your Exchange Online or Office 365 administrator can set policies to move undeleted messages to an archive mailbox that will also appear in Outlook.
Lately I’m having some sync issues with my mailbox. For instance, I see several new emails in my mailbox when I login to webmail which I don’t see in Outlook. Also, it looks like the entire month of June has gone missing in Outlook but the emails are luckily still available on the server. Is there any way to get Outlook to sync or download these emails again? Corruptions in the cache are rare (especially for Exchange based accounts) but can still happen under various circumstances like an unexpected shutdown or crash of your computer or Outlook.
In these cases, it might be best to reset the local cache of Outlook and let it rebuild. The process is fairly simple to perform but make sure you do some checks first. Step 1: Verify that the messages still exist on the server The first thing to check is whether all messages that you expect to be on the mail server (via webmail) are still there as well. You don’t actually have to check each and every message. With sync issues you are usually missing emails in Outlook and not in webmail.
However, you do want to pay a bit more attention to folders you recently moved emails into and your Sent Items folder. If you are missing any emails on the server, either drag & drop them out of Outlook and into a folder in your Documents folder (via File Explorer) to save them as msg-file or export/copy them to a pst-file. Both methods will allow you to restore these items to Outlook and/or the mail server later on. Drag & drop messages from Outlook into File Explorer to create msg-files. Step 2: Backup any folders marked with: On this computer only If any of your folders of your mailbox in Outlook are marked with “This computer only”, you’ll need to copy or export the contents of these folders as well before resetting your cache. These folders are likely to exist when you only have an IMAP account configured in Outlook 2013 or Outlook 2016. A good method to find these folders is by switching to the Folder List Navigation in Outlook (keyboard shortcut CTRL+6).
Common folders that are marked with “This computer only” are;. Drafts. Contacts. Calendar. Tasks.
Notes Extra Tip! Configure Outlook to store the “This computer only” folders within a pst-file so you won’t risk losing them and also making it easier to back them up. For more details see: Step 3: Reset the cache of your account Now that all your unique data from the cache is backed up, you can reset the cache in the following way;.
Open the Account Settings dialog;. Outlook 2007 Tools- Account Settings.
Outlook 2010, Outlook 2013 and Outlook 2016 File- Account Settings- Account Settings. Select the Data Files tab. Select the mailbox for which you want to reset the cache. This will most likely refer to an ost-file, but for IMAP accounts in Outlook 2007 and Outlook 2010, this will be a pst-file. Click the “Open File Location” button. If your ost-file is located in the default location, then this will open the following location in File Explorer; C: Users%username% AppData Local Microsoft Outlook.
Close Outlook and wait for it to be fully closed (just wait 2-3 minutes to be sure). Return to File Explorer and rename the ost-file of your account to.old so it will now be called like;.ost.old. Start Outlook again and it will automatically rebuild the ost-file.
Give it sufficient time to sync (download) your mailbox again. Opening the file location of an ost-file via the Data Files tab in Account Settings. (click on image to enlarge) Step 4: Restoring backed up items If you backed up any data in step 2, then you restore these items after Outlook has finished syncing all your data.
If you backed them up as msg-files, then you can simply drag & drop these files back into Outlook.’ If you created a pst-file, then you can connect to this pst-file in Outlook via;. Outlook 2007 File- Open- Outlook Data File.
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Outlook 2010 File- Open- Open Outlook Data File. Outlook 2013 and Outlook 2016 File- Open & Export- Open Outlook Data File You can then drag & drop these items to their correct folders within Outlook. After a sync interval, these items should be available again within webmail as well, unless the items are stored within “On this computer only” folders. Last modified: July 14, 2017.
This posting is 2 years years old. You should keep this in mind. IT is a short living business.
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This information might be outdated. When you use Microsoft Outlook in cached mode, what I always recommend, and you add additional mailboxes to your outlook profile, you will notice that the OST file will grow. Outlook will download the mailbox items (mails, calendar entries, contacts etc.), and store them in the OST file. This is the default behaviour since Microsoft Outlook 2010. If you want to disable this behaviour, you have two options:. Edit the registry. Use a group policy object (GPO) Edit the Windows registry The easiest way is to use a reg file. Copy this text into a file and save it as disablecachedmode.reg.
Then double click the file and confirm, that you want to import the registry file. 'CacheOthersMail'=dword:00000000 Please note the version number after “Office”.
Outlook Version Outlook 2016 16.0 Outlook 2013 15.0 Outlook 2010 14.0 Make sure that you use the appropriate version number for your Outlook! Otherwise this setting is applied, but not working.
Group Policy If you want to apply this setting on a bunch of clients, you should use a GPO. Before you can use a GPO, you have to install the necessary template files for Microsoft Office/ Outlook. These ADMX files are part of the “” or “” package. Copy the Outlk16.admx or Outlk15.admx files to the PolicyDefinitions folder (either C: Windows or ), and the Outlk16.adml or Outlk15.adml to the corresponding language folder. Then you can create a new GPO. The desired setting can be found under User Configuration Administrative Templates Microsoft Outlook 201x Outlook Options Delegates Disable shared mail folder caching.
Set this to “enable” and apply the GPO. Still using Microsoft Outlook 2010? Please note, that the GPO template for Microsoft Outlook 2010 doesn’t contain the necessary setting that controls this functionality!