The CommuniGate Pro IMAP module implements many IMAP extensions. Some of these extenstions work in the implementation-specific manner.
QUOTA: Each account has its own Quota Root
NAMESPACE: The standard CommuniGate Pro "account name" prefix. The tilda (~) symbol can be used to access Mailboxes in other Accounts. The ~public prefix is reported as the Public Namespace prefix, but it is the responsibility of the Domain Administrator to ensure that the Account public is created in the proper Domain.
UNSELECT: This IMAP command is equivalent to the CLOSE command, but it does not expunge any message marked as \Deleted.