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Exchange 2010 Hybrid with DirSync - Full Mailbox Access

Hey all,

When configuring Full Mailbox Access between users on Office 365 in a Hybrid Exchange 2010 environment, is it PowerShell only? Seems like you loose this ability once the users are moved and show up in EMC as Remote Mail Enabled Users.
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Gareth Gudger
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Gareth Gudger
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1 Solution
 
Hello WorldCommented:
Hi,

This issue may be caused by the permission inheritance, please try below steps to resolved this question:
1. Disable mailbox on-premises: Disable-Mailbox <UserMailbox>
2. Convert the user's on-premises mailbox to a remote user mailbox.
Enable-RemoteMailbox  -Identity <UserName> -RemoteRoutingAddress <UserName@domain.mail.onmicrosoft.com>

More details about this issue, please refer to: http://support.microsoft.com/en-us/kb/2745710.
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Gareth GudgerAuthor Commented:
Hi Ya Li,

That's not the issue.

What is the proper way to enable Full Mailbox Access in Exchange 2010 Hybrid? Doesn't appear possible in the EMC with the MEUs. I assume this is only possible via EMS.
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Vasil Michev (MVP)Commented:
Gareth, I'm pretty sure I'm missing something here, but if the mailboxes are in O365, why granting permissions on-prem? I'm also sure you know that cross-premises permissions are not supported.
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Gareth GudgerAuthor Commented:
I may be missing something myself.

I had assigned Full Mailbox permissions directly in Office 365 and then it appears after a period of time that the Full Mailbox permissions previously set would vanish. I assumed they were disappearing after a DirSync. I may be wrong.

I know there are some things you can not set directly in Office 365 when you have DirSync/ADFS configured because it warns you it is synchronized from on premise. I assumed Full Mailbox Access might be one of those.
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