Domain User settings and frequent employee changes

I am wondering what the best practice would be in setting up a user in a W2003 domain when the employee may change frequently but still need access to the same email and files. The email is NOT on an Exchange Server. It downloads from a internet POP3 server to Outlook. It’s possible I may set up the 2003 email down the road, but Exchange is not an option.
This is for a front desk situation, where the catchall email box sends all it’s email, and they also send out email blasts to clients.
Can I rename the user account when a receptionist leaves and a new one comes in, or is that just trouble? Or do I make a Receptionist account and just use that one account for anyone that is there?
Thanks for the help! TC