User "%1" was prevented connecting to his/her mailbox because the Mailbox Server resides in a different ActiveDirectory site ...

User "%1" was prevented connecting to his/her mailbox because the Mailbox Server resides in a different ActiveDirectory site (%2) than the Client Access Server (%3) to which he/she connected.  Either arrange for the Client Access Server and the Mailbox Server to reside in the same site, or change the configuration setting of AllowCrossSiteSessions to true.
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