Non-matching mailboxes are those that do not have an extension number on the local MERLIN MAGIX system. Select Keep if you want to keep original and revised mailbox and transfer-only programming. For example, select Keep if you want to keep extension programming for remote users in a centralized voice messaging arrangement. Select Delete if you only want to keep Mailbox and Transfer-Only programming that has been revised.

Regardless of whether you choose Keep or Delete, all Automated Attendant, Fax, and Guest Mailbox programming is left unchanged.