Of course, the question is not as simple, and your answers will be tenfold more complex than my question.
What thoughts would go into decision making if you were to chose a communications platform for your software engineering team?

Imagine your team is going to grow from tiny (5) to large (200+) over the next 24 months and Office 365 is the predominant productivity tool in the company.

You may take into account these factors:

• accessibility
• image
• privacy
• costs
• flexibility
• data sharing
• speed
• integration of external participants
• availability across operating systems
• adoption
• trend

Or just comment your favourite tool from a gut feeling. But please state what made you chose one over the other.

Happy discussing!