Next off, you are owed NO privacy on services that your company is paying for for interoffice communication. You never have been. The fact that people bitched and moaned over Hipchat allowing history to be viewed is just ignorant and stupid.
You know why managers have the ability to view these things? Harassment. Sexual, physical, altercations, etc. If your company has more than 5 people these things WILL come up and the INABILITY to retrieve this data is BAD.
We have ALWAYS been able to retrieve this data via XMPP (Openfire), MSOffice Communicator/Lync, etc.
This is NOT some mind blowing new development.