Slack is currently experiencing a major outage affecting users worldwide, with issues including error spikes that hinder the ability to open channels, send messages, and use integrated applications. The company has stated that backend database routing is contributing to these errors and is actively investigating the situation with its engineering team. While initially reported as a global outage affecting all users, it has been clarified that the impact is widespread but not universal. Users are facing challenges such as difficulties in starting the application, unsent messages, and problems with loading channels and threads. Slack has committed to providing updates every 30 minutes until the issues are resolved. As of the latest update, operations are reportedly returning to normal after significant disruptions.