Windows 8 Pro Only Offline Activation RETAIL Keys [Retail Edition Only]:

slmgr.vbs -ipk MWNYV-R494V-379DP-HX62G-KTJXV
slmgr.vbs -ipk NT8YX-Q8F3V-XY4MF-44DCK-C7F9V
slmgr.vbs -ipk TTJN9-939PX-VVD4T-XRJYB-39H3H
slmgr.vbs -ipk NCHGV-RFPM3-87RXH-6QTJQ-WQG67
slmgr.vbs -ipk FG34W-VKNKH-KBCDC-96676-TJCKV
slmgr.vbs -ipk N7KHK-GV76W-RKJF2-2CB4C-MPWXV
slmgr.vbs -ipk FP9Y8-7GNYW-VGBVQ-RWWK9-HCBQH
slmgr.vbs -ipk HRV72-KN6Y6-M48TM-KGYFJ-RX49V
**[Try to use this keys first, as it pass slmgr /ato on W8 PRO]

slmgr.vbs -ipk GCN86-8TX6P-3FMJJ-VRDTF-QGJXV
[Tested working on 10 March 2013]
[This Keys are currently working also you can add feature WMC
[slmgr /ato] Product Activated Successfully

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Windows 8 RTM Pro WMC Offline Activation RETAIL Keys [Phone Activation Only]
slmgr.vbs -ipk V3FB8-T7MJW-PRW9N-H4RMM-VQTB3 [NEW]
slmgr.vbs -ip  2Y4P6-HRG38-X94PN-XCM7R-84YRQ [NEW]
slmgr.vbs -ip  BT63R-CGM4M-962N2-R879G-H8MRQ [NEW]
slmgr.vbs -ip  CKXVJ-GF9HD-NDFXC-DKQ32-GQ4FQ [NEW]
slmgr.vbs -ip  TCPBC-YXYFP-9NXMJ-XJ9JC-XTJY3 [NEW]
slmgr.vbs -ip  BT63R-CGM4M-962N2-R879G-H8MRQ [NEW]
slmgr.vbs -ip  CKXVJ-GF9HD-NDFXC-DKQ32-GQ4FQ [NEW]
slmgr.vbs -ip  G9BHR-BXYXC-7R4XM-NMR9V-MBFFQ [NEW]
***If any key failed try to use another one****

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All Credit To Original Keys Providers :)
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[More Info]:
http://www.warez-bb.org/viewtopic.php?t=15950523&start=0
NOTE: ***This Forum Topic Updated Daily***

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Microsoft Windows 8 Phone Activation Youtube Video Instruction
Windows 8 Permanent Offline Phone Activation:
http://www.youtube.com/watch?v=RwWudQusrP4

Windows 8 Pro With WMC Permanent Offline Phone Activation:
http://www.youtube.com/watch?v=z3W8_5VUvlk

PHONE ACTIVATION METHOD:
**You Need to Disable Internet for a start.**
1. Hold the Mouse on the left corner and Run Command Prompt (Admin)
2. Type this scrip and hit Enter
slmgr.vbs -ipk <Product Key>
Example of <Product Key>: XXXXX-XXXXX-XXXXX-XXXXX-6273P

3. Type this scrip and hit Enter you will get the Error [Ignore the error]
slmgr.vbs -ato

4. Go This Location >>> Control Panel\System and Security\System
and click View detail in Windows activation
5. Hit Activate by phone

6. Next will be choose Country Selection hit that then you come to confirmation ID

***Attention this part:
7a. Download skype FREE [If you do not have it yet]
Registrationis easy too all you need valid mail address
7b.  Dial UK number free call using skype [+448000188354] I strongly suggest use this number first
or
USA [+18664323012]

7c. First question are you home user or business ***[answer home user -dial1]*** Important
7d.Type installation ID without making mistake
7e. After second question how many computer you activated  ***[Only One Dial 1]***Important

8. Type correctly the confirmation ID giving by robot  in the confirmation ID boxes and enter the activation wizard finalize..

9. Check Activation remaine grace period:
slmgr.vbs /dlv

10. Check Volume activation expire
slmgr /xpr

Enjoy Your Microsoft Windows 8  :)