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Check out browsershots - http://browsershots.org/ . I think you can submit a job to check how a page renders on a specific OS-browser combination. Otherwise you can download and check it out - it's open source.

Wow, where has that been all my life?

Thanks a lot for that tip - that's going to come in really handy.

Test it IE6 and IE7 on the same machine: http://blogs.msdn.com/ie/archive/2006/11/30/ie6-and-ie7-runn...

Yes, it's a pain b/c you have to run a VM, but it's the most reliable way of testing IE. Other "shortcuts" won't perfectly emulate IE7 in an IE6 environ, or vice versa.

Thanks for the link!

You can also try this http://www.xenocode.com/browsers/ if you don't want to mess up with browser installations