Ok I'm not sure if this is possible. We have a customer with over 100 users, currently getting their mail through an externally hosted POP3 Service Provider. They want to migrate to Internally hosted Exchange 2003. I will be the only one doing this cutover so it would be very difficult to visit every workstation and change all the outlook clients to point to the new exchange server in one night.
My question is, does anyone have any recpomendations, or is it even possible to have some users accessing email through Exchange and some still accessing email through the externally hosted POP3 server.
I was hoping to configure Exchange to pull mail from the POP3 server until I can get each workstation pointed to the exchange server. Then go ahead switch over the MX record, and remove the POP3 functionality of exchange. I am not sure if Exchange can pull email from the POP3 server on an account by account basis. Or if Exchange simply pulls all the mail off the POP3 server at once
Hopefully someone has doen this before and could lend a few encouraging rods of wisdom.