I will tell you from first hand experience, all of my systems have been converted to Windows 7. I am not just saying it to say because I am affiliated with Microsoft. I can truly stand behind this product and tell you straight away it works very reliably, fast and extremely stable. The 64bit version is a real powerhouse as well.
Microsoft does have an official Windows 7 Support Forum specifically for IT Pros located here http://tinyurl.com/7jq7ps
. It is supported by product specialists as well as engineers and support teams. You may want to also check the threads available there for additional assistance and feedback.
Microsoft Windows Client Team