How to set MSDN in order to open on a certain version of Microsoft SQL Server?
I came up with a thrown-together hack with what I had on hand. If you don't have Fiddler installed, you'll need to get it from http://www.telerik.com/fiddler

Set it to Keep: 100 sessions then go to the AutoResponder tab and add this rule:

If request matches: regex:https://msdn.microsoft.com/en-us/library/ms(\d+)(\(v=sql.(100|105|110)\))?.aspx

Then respond with: *redir:https://msdn.microsoft.com/en-us/library/ms$1(v=sql.90).aspx

If you'd like to use a different version of SQL Server, then change the number at the end of the Respond With string and make sure to take that number out of the If Request Matches string or you'll end up in a redirect loop.

Enable rules and check Unmatched requests passthrough. Fiddler will have to capture traffic (F12) in order for this to function. The configuration screen should look like this: