They were there and they were superior to the alternatives almost out of the gate. I was working for a video game company at the time and me and the rest of the IT dept made the switch almost immediately because the results were clearly superior. Made me an advocate for them for years, probably far beyond where I should have given up. I am not sure which product cancellation finally changed my mind on them. Probably it was around the mess of Google Talk/Chat/Hangouts mess of apps.