Is Oracle not suited as the database behind websites like Stackoverflow? I see from the thread Which tools and technologies build the Stack Exchange Network? that the database specifications are:


  Database SQL Server 2008 R2 running Microsoft Windows Server 2008 Enterprise Edition x64


While this does not necessarily mean that Oracle wont do this job, it does indicate that it is not as good for this part.

How far is it true? What are the reasons?
It just means that the developers were more familiar with the Microsoft stack.