The Office 2016 upgrade does a great job retaining previous settings, particularly for Outlook 2016.
The Office 2016 upgrade is probably one of the cleanest upgrades ever, removing previous versions of Office completely.
Any real changes had to wait for the next version release.
You can now open Outlook and attach files as normal.
I can't take credit for this as I found I it on another forum, unfortunately I can't find it again so my apologies to the person who came up with this solution.
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Warning: Before proceeding, make sure you have updated Outlook to the latest version (patch) currently available.
If you do not update Outlook before proceeding, the potential exists that you will be unable to configure your account to Office 365 (you will receive an error during the configuration process).
Calendar preview in meeting requests When you view a meeting invitation, Outlook automatically displays your calendar alongside the body of the message.
To get there to make the setting change: I've been experiencing the "can't delete IMAPS email" but you describe.
When I select the "Mark items for deletion..." checkbox (and leave the "Purge items when..." checkbox selected), email is indeed deleted. When the "Mark items for deletion..." checkbox is left unchecked, the email is moved to the Deleted folder, but it isn't deleted from the source folder.
Important: The 'User name' field may be pre-populated with your email address you entered the previous step.
You must make sure this address is changed to the format required in this step.
Until then, there are still plenty of new features in Outlook 2016 to use and discover.