Yes they are. I've been given new serial keys because Microsoft fudged something up on their end.
Also, agres, I do suggest a fresh install. I've found when upgrading from Vista SP1/SP2 to Windows7, there are some funny issues that happen. Files being in the wrong places, not being allowed to use the run command because my "rights" were revoked by Windows. Not being able to install products because they're not compatible for "32bit/64bit" Operating Systems.
A lot of my friends suggest a fresh install, and thats what Sevenforums.com told me as well.