Cotap is a messaging startup that has raised $10 million in funding. Cotap was co-founded by two former executives at Yammer and came out of stealth mode last year. Cotap launched their first app on iOS three months ago. The app has been ported over to Android and the desktop recently. Cotap has signed up around 6,000 businesses to use the free app. The free app allows authorized employees to serve a corporate communications so that marketing teams do not get overwhelmed. This round of funding was led by Emergence Capital with participation from Charles River Ventures.