Chatter Messenger missing in orgs created after Spring '16 and is being retired in Spring ’17
|Knowledge Article Number||000233166|
|Description||As per the Spring '16 release notes, Chatter Messenger: Retiring in Spring ’17 and unavailable and no longer supported for new Salesforce organizations created after Spring '16.
For existing organizations which have been created prior to Spring '16 see:
How do you enable Chatter Messenger?
Why I can not see Chatter Messenger for my organization with all supported browsers?
What is Chatter Messenger?
Chatter Messenger Unavailable in New Orgs Starting Spring ’16