POS systems, how fun! ><
In any case, SQL Server 2005 Express should work out nicely for you but there are a few limitations to it:
-It can not utilize more then 1GB of RAM
-It can not utilize multiple CPU's
-The Database size can not exceed 4GB
-No Built in Mgmt tools (Though you can download Express Manager for free which gives you Query Analyzer and such)
-No analysis or reporting tools. (DTS)
The POS side of things should have no problem with the above limitations, however, the financial data may be a problem since (in the states any way) you are required to keep 7 years worth of financials on file in the event that you would be audited. 7 Years worth of data is a lot of information so you need to take that 4GB size limitation into account. (Of course you could back up the .mdf file to DVD at the end of the year, trucate the data tables and start the new year fresh)
hth.
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