В связи с переводом Google Talk на платформу Hangouts, который несовместим с XMPP.
With Hangouts, Singhal says Google had to make the difficult decision to drop the very «open» XMPP standard that it helped pioneer.
Анализ информации произвел Matt Landis блоге Hangouts Won’t Hangout With Other Messaging Vendors: Google’s New Unified Messaging Drops Open XMPP/Jabber Interop
>>> Exclusive: Inside Hangouts, Google's big fix for its messaging mess
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