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purple-hangouts / Differences with XMPP

This plugin uses the proprietary Hangouts protocol, instead of the XMPP bridge that Google provides for legacy clients to connect to its network. The differences between using these two options in Pidgin are listed below

Feature Hangouts XMPP
One-to-one messaging
Hangouts Group chats
XMPP group chats
Rich text formatting
Non-gmail contacts
Receiving images
Sending images
History synchronisation
Offline messages
Google Voice SMS
Mail notifications
OAuth Authentication ✓*
Share location **
Voice and Video **

*OAuth is an optional login mechanism, which Pidgin does not support

**Feature availabe in the protocol but not yet in the plugin