What is the Reason large sites don't use MySQL with ASP.NET?

Posted by Luke101 on Stack Overflow See other posts from Stack Overflow or by Luke101
Published on 2010-04-01T00:25:08Z Indexed on 2010/04/01 0:33 UTC
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I have read this article from highscalability about stackoverflow and other large websites. Many large high traffic .NET sites such as plentyoffish.com, mysapce and SO all use .NET technologies and use SQL SERver for their database. In the article it says SO said

As you add more and more database servers the SQL Server license costs can be outrageous. So by starting scale up and gradually going scale out with non-open source software you can be in a world of financial hurt.

I don't understand why don't high traffic .NET sites convert their databases to MySQL as it is waay cheaper then SQL Server

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