

Key: _LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange OWA To modify this value use the following the registry information: The default number of total recipients allowed is 2000. In their messages you can limit how many recipients that can be resolved on the To:, cc:, bcc: lines combined. If you experience performance issues on your CAS server when users are composing mail and attempting to resolve large numbers of recipients Limit of the recipients, message size, mailbox size and so on.


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