Thankyou for your help Bryan. I have de-installed the evaluation SQL, and I am just waiting on a collegue to supply me with the activation key as I am remote from the site, so I can complete the re-install. Hopefully that should happen within the next hour.
The database and log file are still on the system, so hopefully we will shortly be out of trouble.
Will get back to you as soon as we have a result.
Thanks for your interest and helpful advice. Unfortunately, I had not given you all the necessary information up front. It turned out that the eval version we had been running on was SQL Server 2008 R2, and the Small Bus Server came with SQL Server 2008. So, the database we had been building up under the eval licence was never going to be useable under the SQL server supplied with the system. Too many cooks - my colleague supplied the SBS, and I had not realised it was running the older SQL Server version.
So - we are out of trouble now, we have another 6 months eval copy of 2008 R2 until we organise to upgrade (at some additional cost to our customer) to 2008 R2.
Again, thankyou for taking an interest in my problem, and I am happy to pay you something (whatever you think is a fair thing). For problems requiring an immediate response, it may sometimes be difficult to co-ordinate timewise as we are 1/2 day out of sync, but I have your contact details for future problem solutions.
I'm quite happy with the $69 for now, I would not like to short change you. Thanks again for your interest, and I will certainly keep you in mind for any future assistance.
Cheers XXXXX XXXXX