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Migrated Mailbox Access

Posted on 2015-02-18
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Last Modified: 2015-02-19
We are in the process of migrating some user mailboxes as part of a pilot for full Office 365 migration.

We currently have an Exchange 2010 server, coupled with a complimenting hybrid and DirSync server. Everything on the directory synchronisation side of things has been working well.

When we have come to migrate on-premise mailboxes to Office 365, we have discovered that permissions haven't migrated, specifically any addition mailbox permissons, send as, send on behalf of and calendar permissions. If we subsequently set these permissions manually, it works.

Microsoft are telling us that these have to be set manually, however this is not what we understand is possible. I cannot believe this is accurate - are Microsoft really stating that you have to set this all manually again? What if you had 100,000 mailboxes to migrate - you would have to document and then set these all from scratch?
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Question by:Hypervizor
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by:Vasil Michev (MVP)
ID: 40617137
It depends on the migration method (i.e. delegate permissions can be preserved if users are migrated in the same batch). And the type of permissions we are talking about (send permissions applied to the user object vs mailbox/folder permissions). You can always export the list of permissions to a CSV file and adjust them accordingly after the migration.

Another thing to remember is that cross-premises permissions are not supported:
Cross-premises permissions. It is important to note that we do not support cross-premises permission scenarios. Permissions are only migrated and functional when implementing an Exchange hybrid deployment if there are corresponding directory objects in Exchange Online. Additionally, all objects with special permissions such as Send As, Receive As and Full Access must be migrated at the same time. This also means that to migrate these permissions you must ensure directory synchronization has completed before you start moving mailboxes.
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by:Hypervizor
ID: 40617254
Thanks for the reply.

So, if I'm understanding this correctly, to preserve the calendar, send on behalf of, send as etc permissions you have to migrate users at the same time over to Office?

That seems to be a limitation as I would imagine a lot of people install a hybrid so they can do progressive migrations.

You mention about exporting permissions to a CSV. Can you then apply permissions after they've been migrated and if so can you point me to the script to export and apply?
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Vasil Michev (MVP) earned 500 total points
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by:Hypervizor
ID: 40619148
Thanks.
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