According to TC, Slack has raised a Series E round of $160 million at a post-money valuation of $2.8 billion.

The round includes new investment from Horizons Ventures, Digital Sky Technologies (DST Global), Index Ventures, Spark Capital, and Institutional Venture Partners (IVP). Past investors Accel Partners, Andreessen Horowitz, The Social+Capital Partnership, Google Ventures, and Kleiner Perkins Caufield & Byers all participated. The company has now raised $340 million.

Slack brings all your communication together in one place. It's real-time messaging, archiving and search for modern teams.