Databases

[E. J. Cerejo]

I have a small business and I'm looking to setup a freebsd server.  I 
want to connect about 4 clients to this server running windows XP.  The 
Freebsd server will keep a database of every customer address, phone 
number, what services that were performed, how much was charged, etc 
etc.  This is basically all I need for now and I was wondering which 
opensource database would do this in the easiest possible way.  Also 
what software would I use in the client boxes to access this database 
(input and output).

Best regards to all