I'm a great fan of Slack. Large portion of revenue for an b2b app like Slack will come from big corporations and businesses with more than 200 employees. Micr

I'm a great fan of Slack. Large portion of revenue for an b2b app like Slack will come from big corporations and businesses with more than 200 employees. Microsoft/Google are heavily invested on large enterprises. These big giants can pull off a product like Slack and sell to all the big clients. Microsoft already sells communicator to large corps. They can switch that to Microsoft-Slack version and bundle it with their office products taking the large (90% revenue) out of Slack pocket. Slack has to go really big to hit enterprises hard or they will be just serving small medium businesses which will have churn burn and less LTV.