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4.7.1404.1 (Feb 9, 2011)
Contrary to this being posted as "new" today, this is still just the same release that came out back in November. Same version, same digital signature, etc. If you want the latest version of the Zune software you have to get the patch to 4.7.1407 from http://support.microsoft.com/kb/2498092
2010-10-10 (Nov 24, 2010)
Most full featured codec pack period. Install this and you won't have any problem playing back any file and as an added bonus you don't end up with the mess the K-Lite packs do to systems.
3.3 Alpha 1 (Nov 24, 2010)
Just installed over 3.1.6. No real issues to speak of. Best email client available.
4.6.1 (Nov 24, 2010)
No amount of tweaking can fix such a broken pack.
4.1.0 (Nov 24, 2010)
Still just as awful as ever. Stick with the CCCP instead since it's VASTLY better than this hodgepodge mess of a pack.