The two conditions
Membership is worked out the same way as the Contacts and Companies pages, so a contact who shows up in a segment there matches the condition here. A contact without a company is in no company segment.
A conversation without a contact never matches a segment condition, not even “is not in”. The same is true when the segment has been deleted: the condition matches nobody until you change it. A segment with no conditions, or one whose own conditions use a segment, can’t be picked: saving a routing rule, inbox filter, view or agent filter with it reports the problem.
Where you can use them
Pick Contact segment or Company segment in the filter field list (they appear at the top, next to the other segment options) in:- Routing rules: Settings > Inboxes > Routing. The rule preview counts them too.
- Custom inbox entry filters: Settings > Inboxes > Inboxes.
- Inbox views and the inbox’s filter bar.
- Agent priority filters, and the exceptions under Who answers conversations: on the agent’s page. Segment membership is checked when the conversation needs it and reused for about 30 seconds, so a segment edit reaches a live conversation within half a minute.