We are introducing a new parameter that can be called by using the Set-User cmdlet in Exchange Online PowerShell. The feature is focused for customers doing migration of on-premises mailboxes to the ...
Updated Jul 16, 2021
Version 3.0
Blog Post
Hello,
I have a number of 365 accounts created prior to setting up the Hybrid with my on premise Exchange Server. We want to keep mailboxes on the on premise server. We set up the Hybrid configuration in an attempt to get Calendars in Teams to sync with the on premise mailbox. This functionality works if I create a new user locally however the 80+ users that had 365 mailboxes created previously are not so lucky.
If I delete the online mailbox using this procedure, it works, the mailbox gets deleted online, I can confirm by going into the mail tab of the user and I get the message "This user's on-premises mailbox hasn't been migrated to Exchange Online. The Exchange Online mailbox will be available after migration is completed"
However, for these users the Teams calendar sync does not work while it does work with newly created users. Obviously since this functionality works with new users there must be something else that needs to be done with these users whose online mailboxes get deleted with this method.
Do you have any suggestions?