With Microsoft 365 you can share your calendar with others inside and outside your organisation.
The following instructions work on both PC and Mac. On a Mac you need to make sure you are NOT using the New Outlook view to see these options.
If the top right of your Outlook window looks like this:
You need to switch back to the older settings by clicking the slider toggle.
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In Microsoft Outlook, from your Calendar folder, on the Home menu, select Share Calendar.
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Choose the calendar you want to share from the drop-down menu.
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In the Calendar Properties dialogue box, click Add.
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You can search for people from your address book or type in their email addresses in the Add box. When you're done adding names in the Add Users dialogue box, click OK.
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Back in the Calendar Properties dialogue box, select the person's name or email address, then choose the level of details that you want to share with the person, then click OK.
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The person you've shared your calendar with will receive a sharing invitation by email.
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Once the recipient clicks Accept, they'll see your shared calendar in their calendar list.
I see a "This calendar can't be shared" error
If you see a message that says This calendar can't be shared, there are three possible reasons.
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The email address is invalid.
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The email address is a Microsoft 365 Group
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The email belongs to an external user who isn't part of your organization.
What permissions people have to your calendar
You can choose from several different permission levels when sharing your calendar.
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Can view when I'm busy. Those sharing your calendar with this permission level can only see which times you're available, like this:
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Can view titles and locations. Those sharing your calendar with this permission level will see availability and the subject and meeting location, like this:
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Can view all details. Those sharing your calendar with this permission level will see all details of your appointments, just like what you see.