The beauty of this is that whenever something happens to your cache, you'd simply delete the ost-file of the IMAP account (which was a pst-file in Outlook 2010 and previous) and Outlook would re-cache a fresh copy again.This means that there will always exist a "master copy" of your data on the IMAP server and changes are also being replicated to the server. IMAP mail folders are being cached on the local computer in ost-files.However, from a technical and backup perspective, this isn't a change which should be taken lightly at all.
Especially when you use Outlook with a single (IMAP) account, this configuration is a welcome change as all your Outlook data is contained in a single folder list. The new method in Outlook 2013 and later, to contain non-mail folders within the IMAP ost-file, of course has its benefits as well. Outlook 2013, 2016, 2019, and Office 365 default: Leave things combined For detailed instructions see: Hide, move or delete an Outlook folder via MFCMAPI. Note: If you don’t want to re-cache your entire mailbox, you can use MFCMAPI as well to get rid of the additional “This computer only” Calendar, Contacts, Tasks, etc… folders. Set a pst-file as the default data file to make sure you don't lose any non-synched folders (click on the image to see the view dialog).
Make sure that the newly created pst-files is included in your backup schedule. Your IMAP account will now resynch again but will not create the additional “This computer only” Calendar, Contacts, Tasks, etc… folders. In the Explorer window that opened in step 11, rename the ost-file to. Select the data file (.ost) for your IMAP account. Go back to: File-> Account Settings-> Account Settings…-> tab Data Files. To easily see all the local folders, it is best to use the Folder List Navigation (keyboard shortcut: CTRL+6). To easily move your Calendar items, set the Calendar folder to a List View. Move the items of the non-mail folders to their counterparts in the pst-file. Select to create an Outlook data file (.pst). File-> Account Settings-> Account Settings…. If you preferred this method and would continue to work as such, you can do the following: As a result, you had a folder set containing all your IMAP mail folders and an additional folder set (pst-file) containing the default mail folders (usually empty) and the other default Outlook folders: Calendar, Contacts, Tasks, Notes and Journal. In Outlook 2010, setting your IMAP mailbox as the default data file wasn't possible. Outlook 2010 method: Separate IMAP and non-IMAP data Note: This not only applies to Contacts and Calendar folders but to all folders which are marked with “This computer only”, including Tasks, Notes and Journal folders. It is still perfectly possible to set things up in a separated way as it was in Outlook 2010.īecause of the different configuration options, there are various ways to make a proper backup of your data. In Outlook 2010, Calendar and Contact items were stored in a separate pst-file from the mail items but in Outlook 2013, 2016, 2019, and Office 365 everything is included in the single IMAP ost-file.Īctually, I should say "everything can be included", as it is only required to do so when you set your IMAP data file as the default in Outlook 2013 or later. 
This includes my Calendar and Contacts folder as well which I really cannot afford to lose. These folders I indeed cannot find back on the server. I'm using an IMAP account in Outlook as part of Office 365 and I noticed that various folders now have "This computer only" behind them.
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