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The guts of SQL Server were (and as far as I know still are) a RDBMS named Sybase that MS bought sometime in the mid '90s. Sybase ran perfectly fine on Unix, just without all the GUI crap.

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See http://hal2020.com/2011/07/27/porting-microsoft-sql-server-t... for a history of the SQL Server guts. It is now a complete rewrite of the Sybase code.

Oh, that's fascinating. Thanks!

Originally that was true, but the author mentions NT4 and I believe MS rewrote the engine specifically for NT...

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