Johannes Eisele/Getty Images Happy hump day!Yet another big deal got announced this week. Salesforce said it plans to buy Slack for $27.7 billion. It's the largest acquisition for the software company. If you're not yet a subscriber, you can sign up here to get your daily dose of the stories dominating banking, business, and big deals.Sign up here for our upcoming webinar 'How to land a job in private equity' on December 3 at 1 p.m.