Sinny said:I dont think you would get something like a poweredge for £600-, you could try ebay or even if you have some old friends or a son to enquire at a school to see if they have an old server they can parse with, i did that and payed them £25 for a old file server which was good considering it had a Pentium 3 and 512mb of ram.
given that sbs2003 alone costs around £400 for the standard edition with 5 user licence (going by a quick google) or over £1k for the premium edition with 5 client licences, you probably wont see much change from £600!