Though the word “TM” (means TradeMark) is present at the lower left corner, its basically created for symbolizing pirated version of Windows 7 !
It is present everywhere, If you do a search with the keywords “Windows 7 logo” in Google search, it will yield the following results:
The first result comes is of that Pirated Windows 7 logo!
How they are coming here?
After a rather muddled communication on Logos for Windows Vista, Microsoft focused on the politics of unique logo for Windows 7. Good idea, but in doing so, the company took more time regarding the launch date of the official graphic logo. This gave the time to many “creative” person associated with crack / hack /piracy. Note that the logo is far the most common being the logo of Windows Vista with the letter 7 written over it. Yet it has spread like wildfire (yes I know made any expression), and has permanently positioned in the SERP of the search engines. So much so that even the official media sometimes get it wrong.
For products like Windows 7, everyone will understand the importance if the symbol is blatantly falsified.
The power of backlinks in SEO is really impressive: despite the presence of the official logo on the Microsoft Windows website, the logo is shown on the hundreds / thousands of blogs that takes precedence for the search engines!