More data are necessary. Why Microsoft COR forbade appendices of competitors

Microsoft COR forbade employees to use the free version of a corporate messenger of Slack because of threat information security. For the same reason the corporation limited access to Google Docs, to cloudy service of Amazon.com, Inc. Web Service, to web service to GitHub and the Grammarly appendix. Actually everything is not so simple. Microsoft COR forbade the employees to use at work as free versions of a messenger of Slack, reported the GeekWire edition...