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1. Start by selecting the Calendar button and select the Calendar you are trying to share
2. Then, you will want to click this button on the Home Tab to start the sharing process.
3. Then, you will want to click the Add Button. Once you hit the add button a dialogue box will open where you will add the individuals you want to share the Calendar with.
4. Once you find the person(s) you are attempting to share with you will be able to assign them the permissions they will have with your Calendar (View only, View and make changes, etc…). BELOW I HAVE ATTACHED THE MOST COMMON PERMISSION