M
Martin Harran
[...]
OP said he was using Access which means he's already on Windows.
SQL Server Express can be used in commercial apps.
How much "more free" can you get than no charge?
SQL Server, even Express Edition is much more expensive than MySQL or
PostGres SQL. For starters, you have to spend a couple of hundred $$ for a
MS OS - a lot more if you're going to use it as a server. Windows XP Home
Edition won't hack it.
OP said he was using Access which means he's already on Windows.
Linux, OTOH, is completely free. As are both MySQL and PostGres SQL (as
long as you're not going to include them in a commercial application).
SQL Server Express can be used in commercial apps.