Thank you for your post.
"Microsoft server" can cover a lot of equipment. You may want to check out our technical specifications on our web site.
If this doesn't answer the question, let me know, and I'll try to get more information for you.
We have had a filemaker driven site running for 2 years without any trouble.
We have run it on Windows Server 2003, Windows small business server 2003 and windows server 2003 R2
This is using Filemaker server 9 advanced