The company believes that using Slack and Google Docs is not safe.
Microsoft has banned more than 100,000 employees from using the free version of Slack due to security risks. The company also “does not encourage” the use of Google Docs and the corporate cloud service Amazon Web Service. This was reported by GeekWire edition, citing the company’s internal document.
Versions of Slack Free, Standard, and Plus do not comply with security requirements to protect Microsoft’s intellectual property. Current Slack users should transfer work chats and files to the Microsoft Teams application, which offers the same functionality.
The Slack Enterprise Grid version meets Microsoft requirements, but we advise employees to use Teams, not a competitor’s program.
from Microsoft internal document
Employing Amazon Web Service and Google Docs is permitted only when this is “justified for business reasons”. In GitHub, which is owned by Microsoft, is not encouraged to store “strictly confidential information.”
Microsoft also banned employees from using the Grammarly application, which checks text for errors: “The Grammarly browser extension can access secure information stored in email and documents.”