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Tag Archives: AADSync

Exchange Hybrid – 1 account and 2 mailboxes

Posted on 28.07.2015 by Filip

I have just noticed an issue with Exchange 2010 based hybrid and AADSync. On-prem AD account has assigned on-prem mailbox as well as remote mailbox (Exchange Online – O365). Yes, it seems to be possible, but only technically, because mailbox functionality is broken from end-user point of view at this point.

According my investigation it was caused by wrong procedure by mailbox creation. SD created remote mailbox , ran AADSync, disabled remote mailbox, forgot to run AADSync and created on-prem mailbox immediately.

So what to do then? We have to ensure only one mailbox either in Exchange Online or Exchange On-prem so based on our needs.

I decided to keep on-prem mailbox, because it was used by affected end-user.

Well, I exported all mailbox data from remote mailbox to PST file. There are a few possibilities how to do it e.g. via Outlook or eDiscovery search. I wanted to expert all available mailbox data including dumpster so I preferred eDiscovery approach (be aware to have mailbox still enabled during that time).

When I had the PST I quickly removed remote mailbox and account from Azure AD Recycle Bin. After that I imported the PST into on-prem mailbox and ran AADsync to ensure mail user object in O365.

 

Posted in Exchange Hybrid, Exchange Server - Errors | Tagged 1 account 2 mailboxes, AADSync, eDiscovery search, Exchange 2010 based hybrid, Exchange Online, O365, Remote Mailbox | Leave a comment
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