I've installed the Open Source edition of Zimbra, and I am impressed. My company is migrating from a hosted Exchange solution, with about 350 users.
Can someone advise me on the hardware spec for 400 users?
My test box is an 8 CPU Xeon box, 4GB of RAM and 80GB of disk space (6 drive bays) - but what would my production server look like, including space to make data dumps and backups?
Thanks again for the great support on the forums so far.