I currently have a Redhat 7.X box with sendmail V8.11.2. We are installing a exchange 2003 server soon. We have 400+ users cuurently using outlook with PST files. We are migrating them all to outlook web access. Is there anyway for me to migrate users one by one from sendmail to exchange. Can i have sendmail forward particular users email to exchange. I basically need to have both mail servers working at the same time until the migration is finished. Is this possible?