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

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Step-by-step guide

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

3. Add a calendar Image Removedthe IT calendar 
   

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   Here's the Server URL for copy and paste: https://outlook.office365.com/EWS/Exchange.asmx