Well most of the team is remote and we use Google Apps which doesn't allow email access (as far as I can tell, at least not without changing passwords and a few other tricks).
There is a difference between having a feature which allows someone to view your private chat logs (something Google Apps doesn't have) and what it sounds like HipChat are implementing - though maybe they're going to make it just as difficult?
There is a difference between having a feature which allows someone to view your private chat logs (something Google Apps doesn't have) and what it sounds like HipChat are implementing - though maybe they're going to make it just as difficult?