Evaluating open-source DBs -Firebird Enterprise ready ?

The thread is on joelonsoftware.com and the question is about open source databases  :

Quick issue, everyone.  My company currently uses SQL Server, but we’re going to look at open-source databases because of MS’s crooked licensing rules (to be honest, they only have one SQL license, and are running it on a two-processor machine).  They don’t want to shell out the extra $6,000 for another one, and I don’t blame them.

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