While HiChat may seem as an interesting option for small comanies or for very small teams that do work totally isolated from the rest of the company, it has almost no chances to sucess in Corporate.

Most corporations are using Microsoft Lync and some of them do also use the XMPP interface for Lync.

Use case: the entire company is using Lynx for internal communications (>10k employes) and we do want to benefit from IM integration in Jira and Confluence.

Third Party Connector for JIRA Server
https://marketplace.atlassian.com/plugins/com.benryan.jira.plugin.lync-connector

Third Party Connector for Confluence Server
https://marketplace.atlassian.com/plugins/com.benryan.confluence.plugin.lync-connector

Neither are available for Cloud.
Neither provide the notification abilities of HipChat