When connecting to your Microsoft/O365 account, the following permissions are requested:

Specific details on these permissions can be found here or here.

• Send mail as a user
  • Mail.Send
    • Allows the app to send mail as users in the organization. 
• Read a user's calendar
  • Calendars.Read
    • Allows the app to read events in user calendars.    
• Write to a user's calendar
  • Calendars.ReadWrite
    • Allows the app to create, read, update, and delete events in user calendars. 
• Sign in and read user profile
  • User.Read
    • Allows users to sign-in to the app, and for the app to read the profile of signed-in users. It also allows the app to read basic company information of signed-in users.
• Maintain access to data you have given it access to
  • Offline Access   
    • When a user approves the offline_access scope, it allows the app to receive refresh tokens from the Microsoft identity platform token endpoint.