[ale] One email address, multiple users

[PairOfTwins]

Gang:

A local business takes orders online (about 150 per day, each order a 
separate email) and processes them from 1 workstation.  They'd like to 
have 3 workstations processing that same batch of incoming emails.  The 
goal is for each user to see which emails had been responded to, and 
process only the ones that hadn't.

My basic approach would be an IMAP setup.  Any better idea?  More 
sophisticated solution?

Tom