Salesforce CRM giant strikes a deal to acquire Slack for $27.7 billion. The two companies made it official today. Recently Salesforce surpassed $20 billion in annual revenue. The acquisition of $27.7 billion is the largest deal that the customer relationship management (CRM) giant Salesforce has made. The deal is bigger than Microsoft’s acquisition of LinkedIn for $26.2 billion. This big giant deal is expected to complete in year 2022 after post regulatory and shareholder approvals.