A user was accidentally deleted from active directory as he was a member of a test OU that was deleted via group policy management.
We restored this user, reapplied appropriate permissions, re-imported data from his .OST (so we lost no PIM data withing Outlook/Exchange), etc.
We ran into an issue where we had to delete all partnerships and syncs with devices he used, with the restored AD user account. My guess is that this account has a different SID-type attribute where it's considered a different user account as far as active directory is concerned.
Therefore the problem now is, that he's no longer considered the owner or originator of any meeting in his Calendar. Of course this user has potentially thousands of meetings setup for years... so it would be nice if we could somehow make him the owner.
I have a few ideas to make this work, but would like some input on this scenario. Any help is appreciated!