I want to migrate mail from an existing Exchange 2003 server that resides in a Windows 2000 domain to a new Exchange 2003 server that resides in a new Window 2003 domain. If I use exmerge and migrate mail to .pst files, the users cannot forward or reply to emails within the organization. The new exchange 2003 server is configured to use the same email alias format of the old one. My goal is to migrate users mailboxes to .pst files and then configure their new Outlook client to access these .pst files. It doesn't seem to allow user to forward or reply to any of the internal emails in the .pst file.