https://www.reuters.com/article/us-slack-tech-m-a-salesforce-com/salesforce-to-buy-workplace-app-slack-in-27-7-billion-deal-idUSKBN2852PA >Salesforce.com Inc has agreed to buy workplace messaging app Slack Technologies Inc in a $27.7 billion deal, the biggest by the cloud-computing pioneer as it bets on an extended run for remote working and sharpens its rivalry with Microsoft.