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Re:Microsoft, stop sending user identifiers in clear text by bargl on Monday October 05, 2015 @10:29AM (#10332016)
If you can look up skype Id by CID then this also opens your IP up to discovery. Which is a really big deal for people who stream (like my little brother).

But I have no confirmation that is possible or not. Just speculation.

Re:Microsoft, stop sending user identifiers in clear text by mdpopescu on Monday October 05, 2015 @10:36AM (#10332062)
As far as I know, this used to be a big problem in the Starcraft 2 pro gamer community, before everyone switched to naming their account "||||||||" or some such. (They would get DDOSed a lot.)