Is there a Digital River homepage?

Sure there is a Digital River homepage ... go to http://digitalriver.com to see it.

However, they are a SOLUTIONS provider, NOT a retailer or online store.  Among their solutions/services, they provide order fullfillment for Microsoft products (which is why they host the Windows OS downloads - is that why you ask?).

What do you think?

Jan has listed the download links from Digital River servers for the Microsoft downloads and has listed them on his heidoc.net website:

http://heidoc.net/joomla/technology-science/microsoft

He has Office 2007/2010/2013 direct download to the installers.

Windows Vista and Windows 7 direct download link to the .iso or setup files.

Also Microsoft Works 9.0.

Windows 8 Download links are still being sought after.

You still require a valid product key for them however. If you want to use a Digital River .iso for Reinstallation of Windows see the instructions in my Windows Reinstallation Guide:

http://philipyip.wordpress.com/dell-community-forums/ 

Thanks again Mr. Philip!

"What do you think?"

Really?  If you didn't like the answer, next time consider asking a better question - perhaps with some context as to exactly what you are looking for.