After having pissed on Open Source for years and swearing only by Microsoft technologies / C# / SQLServer, Windows, etc., may we ask you why this time you went

After having pissed on Open Source for years and swearing only by Microsoft technologies / C# / SQLServer, Windows, etc., may we ask you why this time you went Ruby on Rails / PostgreSQL? Realized that 99% of the forums out there are running on LAMP stacks and "If you can't beat them, join them"? (I'm not talking about not being able to beat forum software, but about not being able to beat Open Source / Ruby / PostgreSQL / Linux) It's funny to see a die-hard Microsoftie eventually turn his jacket, especially after having defended Windows / C# / SQL Server so strongly for all these years. I'm sure people will use words like "pragmatism" or "that's what the team knew" but still... I can't help but laugh while thinking back at all these blog entires by Atwood pissing on Open Source and pissing on Linux and praising Microsofties as if they were semi-gods.