Popular enterprise messaging platform Slack has announced it will be increasing the price of its Pro plan for the first time, while also making significant changes to its Free plan.From September 1, monthly Pro subscriptions will increase 9%, from $8 to $8.75 per user, per month, and annual Pro subscriptions will increase 8%, from $6.67 to $7.25 per user, per month.Customers wanting to remain on the existing annual Pro price of $6.67 a month for another year can do so by renewing an existing annual plan before September 1, or by upgrading a monthly Pro plan to an annual plan before the same date.To read this article in full, please click here