I need to run a couple of small Virtual Machines.

The system was recently setup - (its only for 10 users !) - now I need to provide a couple VM's
Fujitsu Quadcore Xeon server with 8Gb RAM

Server has 2 volumes 1 x ext3 GroupWise and 1 x nss

I seem to recall NSS is not supported - no problem I have plenty of room on the ext3

I've added XEN and about to create my VM's - but I thought I would check if this configuration is OK
or are there any gottachas ?

Normally I use ESXI but the production Server is NOT on the Authorised list.