Google was among the investors as the workplace communication and archiving app creator raised its second nine-figure round in six months.

US-based online communication app developer Slack confirmed yesterday that it has raised $160m in series E funding at a $2.8bn valuation from investors including internet company Google.

Horizons Ventures, DST Global, Index Ventures, Spark Capital Growth and Institutional Venture Partners (IVP) all took part in the round as new investors. Google Ventures, Google’s corporate venturing unit, was joined by fellow existing investors Accel Partners, Andreessen Horowitz, The Social+Capital Partnership, and Kleiner Perkins Caufield & Byers.

Reports late last month stated…