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And if so, why? Could you put some reference? Here you can see some debate about this question. But I want know per sure, so would be nice if some expert in this matter said something.

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marked as duplicate by techturtle, Brad Patton, Karan, Dave M, Scott May 3 '13 at 19:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Welcome to Super User. (I know you’re not exactly new to the site, but better late than never.) While Super User is a community, we are not a hive mind, and not everybody reads every post. As you know, this (above) question is a follow-up to this question. In fact, the above question was already asked (and answered!) in the comments of the other question. … (continued) –  Scott May 2 '13 at 23:43
    
(continued) Some people will say that you should have just stayed in the comments section of the first question, and not asked a new one. I’m not sure I agree; this is a different (although closely related) question. But if you’re going to make this a new, separate question, you should link to the one where ohope5 said that it was a violation of the EULA. –  Scott May 2 '13 at 23:43
    
Thanks, I will add the reference. –  gsc-frank May 3 '13 at 4:01
    
@Scott - Except this question will just lead to a discussion which means its not a good question for this site. It shouldn't even be discussed within comments section to be honest. –  Ramhound May 3 '13 at 12:38
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@Ramhound I disagreed. This question is a very precise question and any expert in Microsoft EULA that read the procedures available over there to change the language in this version of Windows can determine if such procedures are a violation of the EULA or not, and put references or explain why. –  gsc-frank May 3 '13 at 12:59

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This is a legal question, not technical. I give you the details I can but if you need further information you should bear in mind that I'm not a lawyer so my help is very limited, and I can be wrong on different points...
Also bear in mind that legal discretion is different country to country. So maybe, even if you agree with any Microsoft EULA, you may won't do any illegal -thanks to your country's law- by e.g. reverse engineering the OS, or, you may get 300 years in San Quentin for installing Win7 from the same DVD on two different computers...
Anyways. Here's your answer:

Microsoft Windows 7 PROFESSIONAL and Microsoft Windows 7 ULTIMATE both have exactly the same EULA. Both say the following:

MANDATORY ACTIVATION. Activation associates the use of the software with a specific computer. During activation, the software will send information about the software and the computer to Microsoft. This information includes the version, language and product key of the software(...)

Which means activation is mandatory and language information will be sent over to Microsoft to determine if you legally use the software.


The license agreement which explicitly declares you are not allowed to use MUI (but permitted to use LIP!) on Windows 7 Professional, but allowed to use on Ultimate only is described in Windows 7 and Optimized Desktop - Volume Licensing Guide (also available on MS portal). It says the following:

When you acquire Windows 7 Professional licenses, either through Volume Licensing upgrades or through an OEM, you can cover those licenses with Software Assurance to get rights to Windows 7 Enterprise, that offers unique benefits such as, BitLocker Drive Encryption and Multilingual User Interface Language Packs, as well as access to the Microsoft Desktop Optimization Pack(...)

And there's a massive table that describes what benefits you'll get if you buy Enterprise or Ultimate versions of Windows.
In other words, MUI is not "prohibited to use" in Windows 7 Professional, but instead a benefit of Ultimate and Enterprise. So Professional doesn't have this superb benefit, while Ultimate does. So if you use MUI in Professional you technically jail break the OS (or hack, or reverse engineer, etc) and by that, you break the EULA and by that the law (and can be deported to Alpha Centauri - or sentenced to jail for 500 years, probably in San Quentin, you evil madman! - just kidding! :D).

Does that make sense?

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Thanks a lot for your explanation.I agreed that "Professional doesn't have this superb benefit", but the problem is that what is the benefit? I mean, one can said that the benefit is not pass for all the tedious process of configuration and have that feature out the box. That have sense for me due to that neither of the steps change the OS, just configure it. Beside, all data needed come from Microsoft site, so, I think that if Microsoft not forbid the use of MUI in Professionals versions explicitly and allow use it configurating (not tamperering) the OS mean that doing that is not a violation –  gsc-frank May 3 '13 at 15:34
    
I give you an example. Let's say you are at a car dealer. You can buy the same model for 1000USD ("A" option) or for 1200USD ("B" option). "B" includes +1 year warranty for e.g. the windshield. "A" doesn't have that. If you buy "B", you bought the car with a benefit. Now! Let's say you buy both "A" and "B" (you are rich, okay?! :). If "A" gets the windshield broken and you bring it back to the dealer to replace it for free - you broke the law. –  Mark May 3 '13 at 15:38
    
Same applies to Windows 7. You buy "Professional" - the one that doesn't have the benefit of MUI. If you use it, either you do what I wrote earlier ("hack it into the OS"), or, if you download for free from Microsoft, as well as the tool that makes professional use that "new MUI" you use a benefit you are not allowed to - as you didn't buy it. And Microsoft can say, MUIs were added as LIP is legal for Professional too (ie buying a Windows in Canada: you can either use French or English version of Professional - that's LIP). –  Mark May 3 '13 at 15:43
    
I think that the car example you describe not match very well,cos doing what you said is try to pretend that I buy two car warranty instead of just one, analog to use the same windows license in two computer or something, but not analog to the problem we are talking about.In our case, following the example of cars,is like pressing tons cars buttons and spending days entering configurations parameters I get an improved car,a thing that I could avoid if I buy a more expensive model that have such conf out the box.My point is,our example just change Windows config and download data from Microsoft –  gsc-frank May 3 '13 at 16:01
    
@gsc-frank I know what you mean and I'm sure you are keen to believe you can do what you described, and I'm sorry to say this but that would break the EULA. The car example was about what benefits are and how they work. What I tried to describe is, if you bought option "A", you can't get the benefits made available for "B" only. Not even if you bought a "B" too - for "A", you still don't have the benefit, it's not interchangeable. So if you buy an Ultimate Win7, you can use MUI only for that copy, and never for the Professional. –  Mark May 3 '13 at 16:14

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