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.