I'm repeatedly receiving an error when trying to provision a mailbox on
Exchange 2010. The service account has the correct permissions (verified
by using the user through powershell to execute the same command).
However when the Enable-Mailbox command flows from the AD driver I
receive the error: Exchange 2010 Exception. code:0x000000b2 Error
completing exchange 2010 command. ERROR: ExternalEmailAddress is
mandatory on MailUser. Property Name: ExternalEmailAddress. It seems
that it's creating the user as mail-enabled fine but failing when making
them mailbox-enabled; which are two different cmdlets.

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