Hi there, generally MSDN licences are for companies to Develop software for products they can download and TechNet is generally for testing and for trialling software in an environment (they basically just have different licence agreements).
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How many window 7 licenses?
I think it may depend on your subscription, for my developer sub I get a licence key for EVERY version of 7 that can be ACTIVATED 10 times - meaning activation on 10 individual PC's. You get a key for 32 and 64 bit so essentially you get a licence key for every version of 7 and one for each type of processor. you also get every OS before 7 (all the way back to windows 1.0)
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Can a license be used on say a desktop and a notebook?
Yes
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How long are the licenses valid?
I am pretty sure they are valid for the length of your subscription, but if they are already in use then its still fine (you may need to check if the ones you have not used are not valid as I am not 100%)
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Are the licenses as good as buying a boxed version after Oct 22nd?
Most defiantly, the only thing you dont get is a box - but you will get instant download when ever you want.
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Does the other software work the same as Windows 7 say?
Yes
It must be noted that if you buy a subscription and a new product comes out (such as Office 14) - you will also get access to it...they add new products as they come out.
I hope this helps,
Regards,
Patrick (Ping)