> If you were presenting Firefox as an alternative to SQL Server, what
> would your selling points be? We've already talked the benefits of open
> source vs. commercial products to death without a conclusion, so that's
> not going to sell it.
>
> What features of SQL Server am I going to miss if we use Firebird? Is
> there support for complex data types? Extended stored procedures? Native
> XML support?

I suggest you have a look at the following, yes I know InterBase isn't Firebird
and vice versa, but there are still significant similarities, and this would
probably be a good starting point.

http://www.borland.com/products/white_papers/pdf/ib_vs_SQLServer.pdf

Regards
Paul