Miscrosoft has udpated de KB article 897614, this article states that the folowwing Server software are not support within a Microsoft Virtual Server enviroment :
- Microsoft Speech Server
Microsoft ISA Server 2000
Microsoft ISA Server 2004
Microsoft ISA Server 2006
Microsoft SharePoint Portal Server
Microsoft Identity Integration Server 2003
Microsoft Identity Integration Feature Pack
Network Load Balancing (NLB)
Don't ask me what it means because I have used ISA server 2004, SharePoint Portal and NLB in a virtual machine before and everything worked fine.
Source : support.microsoft.com
