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Install Thunderbird. For calendars see Import IT calendar into Thunderbird (linux). 

Install the Lightning add-on. You may also need to run {{sudo apt install xul-ext-lightning}}. Install the Exchange Calendar add-on. 

The exchange server URL is: https://outlook.office365.com/EWS/Exchange.asmx

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1. Add new account
   
   
   
2. In your address book select Add Exchange contact folder
   

3. Add a calendar 

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