These aren't the message boards you're looking for.

Generally the news here is pretty negative when MSSQL is involved -- however there was a blog where someone deployed a C# webapp and was pretty gungho about MSSQL. I tried to find it but couldn't.

postgres runs really well under windows, at this point I wouldn't want to run either sql server or mysql except to service legacy applications that require them.

I use it because I'm forced to lmfao