Need help figuring out permissions for a migration project

Question

Hi all
We are in the middle of a migration from various Exchange environments over to a hybrid Exchange 2010 and Office 365 environment. Recently we had to change the setup for migrating mailboxes from on-premise to on-premise using Quest Migration Manager for
Exchange using legacy agents.
Dell documentation says to use the below command in order to give access for the agent to open and import mails from a PST into the target mailbox. But it does not work and only after setting the number 2 command will it work. I cant work out what I need
to do on the database so that I do not need to add permissions manually to all new mailboxes.
Help is greatly appreciated.
Dell:
Get-MailboxDatabase | Add-ADPermission -User <User> -AccessRights GenericAll -ExtendedRights send-as, Receive-As
also at the very beginning I was given this:
Get-Mailbox | Add-MailboxPermission -user Domain\Service Account -AccessRights FullAccess - InheritanceType All
But I cant give every single mailbox this permission. not an option with 20.000+ mailboxes on a global environment.
What fixes the issue:
Add-MailboxPermission -Identity "user" -User "EUECS\euqmmservice" -AccessRights Fullaccess -InheritanceType all
If only i had a cool signature!! ;)

Answer 1

You want to assign rights to that account for all mailboxes in a particular database?  Try this (where the database is MB01).
Get-Mailbox -Database MB01 | Add-MailboxPermission -User "EUECS\euqmmservice -AccessRights FullAccess
When you're done you can revoke the rights with the Remove-MailboxPermission cmdlet.
Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."