To go along with my previous post on deploying Windows via MDT 2010, here is a list of the “default” keys that Windows uses when you choose not to enter a product key during setup.  These keys of course will not activate, but you can enter them into your task sequences when you are prompted for a product key to use.  This will make your setup more unattended.

Here’s the list:

Windows Vista:

• Ultimate  -  VMCB9-FDRV6-6CDQM-RV23K-RP8F7
• Business  -  4D2XH-PRBMM-8Q22B-K8BM3-MRW4W
• Home Premium  -  X9HTF-MKJQQ-XK376-TJ7T4-76PKF
• Home Basic  -  RCG7P-TX42D-HM8FM-TCFCW-3V4VD
• Starter  -  X9PYV-YBQRV-9BXWV-TQDMK-QDWK4

Windows 7:

• Ultimate  -  D4F6K-QK3RD-TMVMJ-BBMRX-3MBMV
• Professional  -  HYF8J-CVRMY-CM74G-RPHKF-PW487
• Home Premium  -  RHPQ2-RMFJH-74XYM-BH4JX-XM76F
• Home Basic  -  YGFVB-QTFXQ-3H233-PTWTJ-YRYRV
• Starter  -  7Q28W-FT9PC-CMMYT-WHMY2-89M6G

Note that these were easy to acquire, as they are stored in a file called product.ini in the \sources folder for Vista, Server 2008, Win7, and Server 2008 R2.  To verify, I installed Windows Vista and Windows 7 without a product key, and then ran a utility in the OS to display the current product key – I used GetKey written by GunSmokingMan on the MSFN forums, but anything that’ll run in Vista or Windows 7 will work.