Microsoft's Software Is Malware - GNU Project - Free Software Foundation
https://www.gnu.org/proprietary/malware-microsoft.html.en

Microsoft's Software is Malware
Other examples of proprietary malware

Malware means software designed to function in ways that mistreat or harm the user.
(This does not include accidental errors.) This page explains how Microsoft software
is malware.

Malware and nonfree software are two different issues. The difference between
free software and nonfree software is in whether the users have control of
the program or vice versa. It's not directly a question of what
the program does when it runs. However, in practice nonfree software is
often malware, because the developer's awareness that the users would
be powerless to fix any malicious functionalities tempts the developer to impose some.
Microsoft Back Doors
Microsoft has already backdoored its disk encryption.
Microsoft Windows has a universal back door through which any change whatsoever
can be imposed on the users.
More information on when this was used.
In Windows 10, the universal back door is no longer hidden; all “upgrades”
will be forcibly and immediately imposed.
Windows 8 also has a back door for remotely deleting apps.
You might well decide to let a security service that you trust remotely deactivate programs that it
considers malicious. But there is no excuse for deleting the programs, and you should have the right
to decide who (if anyone) to trust in this way.
German government veers away from Windows 8 computers with TPM 2.0 due to potential
back door capabilities of the TPM 2.0 chip.
Users reported that Microsoft was forcing them to replace Windows 7 and 8 with all-spying Windows 10.
Microsoft was in fact attacking computers that run Windows 7 and 8, switching on a flag that said whether to
“upgrade” to Windows