A.Use the Exchange Task Wizard to migrate all the mailboxes to the Exchange 2003 server
B.Use the Exchange Mailbox Merge Wizard (Exmerge0 to migrate all the mailboxes to the Exchange 2003 server
C.Use the Exchange Server Migration Wizard to migrate all the mailboxes to the Exchange 2003 server
D.Export the contents of each mailbox to a .pst file. Create a new mailbox on the Exchange 2003 servers for each existing mailbox. Import the .pst file contents into each new mailbox