I am pretty sure that MSXP will be the last Microsoft OS I own.

The adware framework would leave almost no data untouched in its quest
to sell you stuff. It would inspect “user document files, user e-mail
files, user music files, downloaded podcasts, computer settings,
computer status messages (e.g., a low memory status or low printer
ink),” and more.
I think this could be really bad for PR... but hey, they're microsoft... and the masses love them.