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In Microsoft Exchange Server 2007, you may set a storage limitation for users so that the database has a suitable size and performance. However, when IMAP4 users use a Copy command that copies items from a folder to another folder in the mailbox, an increase in database size is unexpectedly generated. The user's mailbox may exceed the send or receive limitation.
Exchange Server 2007 does not perform a storage size check during the Copy command.
To resolve this problem, install Update Rollup 7 for Exchange 2007 Service Pack 1. For more information about Update Rollup 7 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: