[CentOS] SQL Server 2005 and CentOS?

One of my clients use a software product that is "upgrading" and will 
shortly utilize micro$oft SQL server 2005.
Currently the clients are XP on older machines with the database 
residing on a Samba / CentOS server and this works very well.
Question: Does anyone run SQL server from XP in a virtualbox on CentOS?
Any other configuration that works on a linux server?
I do not want to have to buy another server grade machine just for this 
application.
Thanks for your insight.
Rob
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