Not true. Lync is a piece of shit. My current company uses Sky pe for business and guess what is the most annoying aspect: messages don't reach the other end sometimes!!!!!

It also freezes, a LOT. We finally forced our manager to let us use Slack and we love it.

I actually don't mind Lync where I work, although I exclusively use it for IMing and sending pictures of chips back and forth. I'd personally prefer an IRC chat that everyone is logged into, but my guess is that the less technologically-inclined folks on my shift would definitely prefer Lync, and it's fine for my purposes anyway.