We've had some problems restoring mailboxes at the TDP for Exchange 6.4.1 level, which worked in the 6.4.0 level. We will certainly open a PMR, but would there be a problem going back to 6.4.0 in the meantime? That is, would we have a problem restoring 6.4.1 backups with the 6.4.0 client?
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