1 to 1 discussions are done in communities where conversations are segregated based on relevant topics. Attributes are defined for users that control the communities in which they can communicate. Users that have multiple communities in common are able to have simultaneous conversations .When users do not share communities they will be unable to communicate in IM conversations.
When in the web client, the available communities will appear as tabs when an IM conversation has been opened. The all communities tab will show messages from all of the users' available communities, with a banner that separates the messages based on the community they were sent from. When no community is selected no messages can be sent, and when a community is set, only messages in that community are displayed.
When communities are enabled, archived messages are grouped by the community they were sent in. Those community conversations will then be saved in individual threads under the archived conversation.