When moving a mail file within Exchange 5.5, the server locks the file until the move is completed. When moving the Exchange 5.5 mailbox to Exchange 2003 is there anyway to keep the mail file from being locked? While the mail file is locked, mail is getting bounced. We have some files that are 2GB in size and it takes awhile to move them. We lose a lot of mail. I am wondering if there is a tool or a better way to do this. We can't really hold all the company mail while we move mail files.