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Re:WhatsApp's Signal Protocol integration is now complete by koenigdavidmj on Tuesday April 05, 2016 @01:35PM (#11432498)
I just checked this with a group chat I'm in, and it said that it was not yet enabled because one person has not yet updated.
Re:WhatsApp's Signal Protocol integration is now complete by spikengineer on Tuesday April 05, 2016 @03:46PM (#11433720)
After a few weeks, non-updating users will get a stern warning that Whatsapp will stop working until they update. Whatsapp does this with every version. They expire every few months.