The user can't be accessed because they have an Exchange 2007 mailbox. A mailbox policy can't be set for users who have Exchange ...

The user can't be accessed because they have an Exchange 2007 mailbox. A mailbox policy can't be set for users who have Exchange 2007 mailboxes. They can only be set for users who have Exchange 2010 mailboxes. If this user is migrated to an Exchange 2010 mailbox, a mailbox policy can be set.   Note: If you migrate a user from an Exchange 2007 mailbox to an Exchange 2010 mailbox, any settings that you previously set on a per-user basis using segmentation won't be migrated.
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