DO NOT USE WINDOWS

All text typed on the keyboard is
stored in temporary files, and sent
(once per 30 mins) to:
oca.telemetry.microsoft.com.nsatc.n
et
pre.footprintpredict.com
reports.wes.df.telemetry.microsoft.
com
Telemetry is sent once per 5 minutes, to:
vortex.data.microsoft.com
vortex­win.data.microsoft.com
telecommand.telemetry.microsoft.com
telecommand.telemetry.microsoft.com.nsatc.net
oca.telemetry.microsoft.com
oca.telemetry.microsoft.com.nsatc.net
sqm.telemetry.microsoft.com
sqm.telemetry.microsoft.com.nsatc.net
typing the name of any popular movie into your local file search starts a
telemetry process that indexes all media files on your computer and transmits
them to:
df.telemetry.microsoft.com

reports.wes.df.telemetry.microsoft.com
cs1.wpc.v0cdn.net
vortex­sandbox.data.microsoft.com
pre.footprintpredict.com
When a webcam is first enabled, ~35mb of data gets immediately transmitted
to:
oca.telemetry.microsoft.com
oca.telemetry.microsoft.com.nsatc.net
vortex­sandbox.data.microsoft.com
i1.services.social.microsoft.com
i1.services.social.microsoft.com.nsatc.net
Everything that is said into an enabled microphone is immediately transmitted
to:
oca.telemetry.microsoft.com
oca.telemetry.microsoft.com.nsatc.net
vortex­sandbox.data.microsoft.com
pre.footprintpredict.com
i1.services.social.microsoft.com
i1.services.social.microsoft.com.nsatc.net
telemetry.appex.bing.net
telemetry.urs.microsoft.com
cs1.wpc.v0cdn.net
statsfe1.ws.microsoft.com

f this weren't bad enough, this behaviour still occurs after Cortana is fully
disabled/uninstalled. It's speculated that the purpose of this function to build
up a massive voice database, then tie those voices to identities, and
eventually be able to identify anyone simply by picking up their voice, whether
it be a microphone in a public place or a wiretap on a payphone.
Interestingly, if Cortana is enabled, the voice is first transcribed to text, then
the transcription is sent to:
pre.footprintpredict.com
reports.wes.df.telemetry.microsoft.com
df.telemetry.microsoft.com
While the inital reflex may be to block all of the above servers via HOSTS, it
turns out this won't work: Microsoft has taken the care to hardcode certain
IPs, meaning that there is no DNS lookup and no HOSTS consultation.
However, if the above servers are blocked via HOSTS, Windows will pretend
to be crippled by continuously throwing errors, while still maintaining data
collection in the background. Other than an increase in errors, HOSTS
blocking did not affect the volume, frequency, or rate of data being
transmitted