We use webmail only. 210 users across 21 counties in central NE. Most viruses need OE to execute. Don't have to transfer e-mail from one computer to another during upgrades. Don't have to configure new users or new computers for email. Don't have to patch OE security issues. With Clamav and ASSP we don't have virus or spam problems. The webmail we currently use is Horde....IMP, turba, kronolith, mnemo, nag, and vacation. It's been working well for a few years now. The new Horde version is on just about ready. Lots of new features, such as shared calendars, tasks, memos, etc...