Huge problem for on-prem Hipchat customers. Plenty of customers out there not willing to put all their internal communications on the other side of their firewall, and now have to migrate. Slack doesn't have an on-prem option. Microsoft Teams doesn't have an on-prem option. What are enterprises supposed to use, RocketChat? Matrix? With no clear migration path? Really poor move on Atlassian's part. It would be one thi…
It's Java so runs just about anywhere, and with even relatively low resource allocations, you can support a large number of concurrent chats and group sessions. Plus, since XMPP is an Open Standard, you can use any XMPP complaint client of your choosing.
Cisco embeds Openfire in a few of their enterprise products already (including Finesse), so you might have used it without even knowing.
The IgniteRealtime community is pretty active and new releases come out regularly[2].