I do a lot of "Hybrid" migration and find about 25% of users still need to have new profiles created to avoid issues.
To minimize this we configure those accounts to only receive the minimum mail for offline access.
Most users now have Outlook from Office 365 installed, with a couple still on Outlook 2010.
This discussion suggests they need to add a new account and presumably delete the old one when it's no longer needed...
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Visit Stack Exchange I'm migrating from hosted Exchange 2007 using Sherweb to using Office 365.
To resolve this, you need to create a new Outlook profile and set it as the default one.
Outlook should now open without any errors and connect to the correct Exchange server. Verify you are connected to the network and are using the proper server and mailbox name.The Microsoft Exchange information service in your profile is missing required information.Also - if you have internal users and have not decommissioned your Exchange server than Outlook with pickup settings via SCP entries for Active Directory.Auto Disocver does not always negate the need to recreate the profiles.In a few cases you will end up re-creating profiles - I've not had a single migration yet where that was not the case so I always prepare for that.