Dodgy legal ground..
Microsoft have always been on dodgy ground with the "agreements" you are required to click through on a new machine or after installing a retail copy of their software.
In English law (covering contracts), adding conditions after the sale is agreed is barred - so click-through or shrink-wrap style conditions are meaningless.
It's also now illegal under general sale of goods laws to even imply that the buyer has any less legal rights than they really do have in law - the old "You cannot do anything" (statutory rights not affected) style clause is banned..
If you ask Microsoft why they leave such clauses in English products, they don't seem to want to reply to the question - I have tried in the past..
This latest idea yet again changes or reveals conditions / agreements after purchase, which appears to again be illegal in English law.