[waseem_]

Skype is actually pretty good for teams. I used to work at a company where it was our primary medium of communication, and we were almost forty people. It's extremely easy to create a group chat in Skype and destroy it with IRC OPs like features. It is also tempting to use since Skype provides a way to initiate a voice call right there from the chat. And one can always access the chat history as well. People have also written Skype bots.

[lmm]

Skype bots that have to be hosted with someone clicking the buttons in the UI, or that get broken every time Skype updates, no?

I wouldn't want to trust any business use to something that doesn't provide a documented API that I can use from my own code.

[kolev]

Skype is a resource hog - especially on mobile. Plus, no API, no thank you! (Disclaimer: I'm actively using Skype as work, just because everybody's so used to it.)