In one of our recent 365 migration, User acted a little smart and decided not to create new outlook profile for 365 and rather just add the 365 exchange account as an additional account to the existing profile.
They wanted to do this so that they do not have to add the additional imap or Pop accounts on the new 365 profile, But to do this they definitely had to remove the existing same account which was added from the previous provided to the same profile.
They successfully removed the account from some of the computers and added the new 365 one just fine. However on some PC’s this earlier same (as 365) email account was the first one added when that profile was created hence it was the primary account, when they tried to remove the primary account it gave the following error
The primary account cannot be removed unless it is the only account in the profile. You must remove all other Exchange accounts before….
Unfortunately we didn’t fix the issue, we researched and did find some of the other blogs like below discussing a solution
but the solution seemed a little cumbersome and did go well on a machine where customer tried ( He had too many other accounts configured in the profile and it screwed up the others) , Thankfully we had a backup of Registry which we merged to fix the concern.
We do not deny the possibility that its un doable, but there are possiblities that by editing registry and removing primary account this way we may end up with a bigger issue in future, Hence our recommendation would be simply create a new outlook profile
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