Coordinating schedules across a team is one of those friction points that quietly costs hours every week. Whether you’re booking meetings, tracking project deadlines, or simply trying to know when a colleague is available, shared calendars in Microsoft Outlook solve the problem at the source. Instead of chasing availability over email or relying on people to keep a spreadsheet up to date, a shared calendar gives everyone a live, accurate view of what’s happening and when. This guide covers every method available in Outlook and Microsoft 365, from sharing your personal calendar with a colleague to setting up a team-wide group calendar.
\n\n\n\nThree Ways to Share a Calendar in Outlook 365
\n\n\n\nBefore diving into the step-by-step instructions, it helps to understand that Outlook and Microsoft 365 offer three distinct approaches to calendar sharing. Each one suits a different use case.
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- Share your personal calendar — the simplest option. You invite a specific colleague to view (or edit) your own Outlook calendar. Best for one-to-one transparency, such as an executive sharing their diary with an assistant. \n\n\n\n
- Microsoft 365 Group calendar — every Microsoft 365 Group (including Teams channels) comes with a shared calendar that all group members can view and edit. Best for project teams and departments who need a central place to log team events. \n\n\n\n
- Shared mailbox calendar — a shared mailbox in Microsoft 365 includes its own calendar. Any user with access to the mailbox can view and manage that calendar. Best for team inboxes like support@yourcompany.com where everyone needs to see scheduled callbacks or customer appointments. \n
How to Share Your Personal Outlook Calendar
\n\n\n\nThese steps apply to Outlook for Windows (Microsoft 365 subscription version). The process is similar in Outlook for Mac and the Outlook web app.
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- Open Outlook and click the Calendar icon in the navigation bar at the bottom left. \n\n\n\n
- In the Home tab on the ribbon, click Share Calendar. \n\n\n\n
- If you have multiple calendars, select the one you want to share from the dropdown that appears. \n\n\n\n
- In the sharing invitation window, type the name or email address of the person you want to share with in the To field. \n\n\n\n
- Use the Details dropdown to choose the permission level you want to grant (see the section below for a full explanation of each level). \n\n\n\n
- Add a message in the body if you want to give the recipient some context, then click Send. \n\n\n\n
- The recipient will receive an email invitation. When they click Open this Calendar, your calendar will appear in their Outlook under Other People’s Calendars. \n
You can share your calendar with multiple people by repeating this process or by adding more than one recipient in the same invitation. To change permissions later, go to Calendar Properties and select the Permissions tab.
\n\n\n\nCalendar Permission Levels Explained
\n\n\n\nOutlook offers granular control over what a recipient can see or do with your calendar. Choosing the right level matters, particularly when sharing with people outside your immediate team.
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- Can view when I’m busy — the recipient can only see blocks of time marked as busy or free. No event titles, locations, or details are visible. Suitable for colleagues who simply need to check your availability before booking a meeting. \n\n\n\n
- Can view titles and locations — the recipient can see the event name and location but not the full description or attendee list. Useful when you want people to see what you’re working on without full transparency. \n\n\n\n
- Can view all details — read-only access to everything in your calendar, including descriptions, attendees, and attachments. The most common setting for open, collaborative teams. \n\n\n\n
- Can edit — the recipient can create, modify, and delete events on your calendar. Use this when a colleague genuinely needs to manage your schedule on your behalf. \n\n\n\n
- Delegate access — the highest level. A delegate can not only edit your calendar but also send and respond to meeting requests on your behalf. The standard setup for an executive and their personal assistant. \n
How to Accept a Shared Calendar Invitation
\n\n\n\nWhen someone shares their calendar with you, you will receive an email in your Outlook inbox. Here is how to accept it and get the calendar to appear in your Outlook.
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- Open the sharing invitation email in your inbox. \n\n\n\n
- Click the Open this Calendar button in the message body. \n\n\n\n
- Outlook will ask whether you want to add this calendar and view it alongside your own. Click Yes. \n\n\n\n
- The shared calendar will now appear in your calendar panel under Other People’s Calendars in the left sidebar. \n\n\n\n
- Tick the checkbox next to the calendar name to display it in your calendar view. \n
If you do not receive an invitation email, the calendar owner may need to resend it, or you can add the calendar manually using the method in the next section. Problems with meetings not appearing correctly after this step are sometimes linked to sync issues — see our guide on fixing Outlook calendar meetings not showing for troubleshooting steps.
\n\n\n\nHow to Add Someone’s Calendar Manually
\n\n\n\nIf you have been granted access to someone’s calendar but did not receive an invitation email, you can open it directly in Outlook without needing them to resend anything.
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- In Outlook, go to the Calendar view. \n\n\n\n
- In the Home tab, click Open Calendar in the ribbon. \n\n\n\n
- Select Open Shared Calendar from the dropdown. \n\n\n\n
- In the dialog box, type the name or email address of the person whose calendar you want to open, then click OK. \n\n\n\n
- If you have been granted the appropriate permissions, the calendar will open immediately and be added to your sidebar. \n
This method also works for opening resource calendars, such as meeting room calendars, where there is no individual invitation process.
\n\n\n\nHow to Create a Microsoft 365 Group Calendar
\n\n\n\nFor teams who need a single shared calendar that everyone can contribute to, a Microsoft 365 Group calendar is the better solution. Rather than sharing one person’s diary, it is a neutral calendar that belongs to the whole group. Every Microsoft 365 Group — including groups created via Microsoft Teams — automatically has one.
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- In Outlook, go to the Calendar view. \n\n\n\n
- In the left panel, look for the Other Calendars section. Click the + icon or right-click and select Add Calendar. \n\n\n\n
- Alternatively, create a Microsoft 365 Group by going to New Group in the People section of Outlook. Set a name, description, and privacy level, then click Create. \n\n\n\n
- Once the group exists, its calendar will appear automatically under Group Calendars in every member’s Outlook. \n\n\n\n
- Add events to the group calendar just as you would to your own — they will appear for all members immediately. \n
If your organisation uses Microsoft Teams, group calendars are accessible directly inside Teams under the Calendar tab. This makes them particularly useful for project teams who are already coordinating in Teams. For full details on connecting these two tools, see our guide on how to integrate Microsoft Teams with Outlook Calendar.
\n\n\n\nViewing Multiple Calendars Side by Side
\n\n\n\nOnce you have set up shared calendars, Outlook gives you two ways to view them alongside your own: side by side or overlaid. Both options are available by selecting multiple calendars in the left panel.
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- Side by side view — each calendar appears as a separate column in the day or week view. This makes it easy to compare schedules at a glance, particularly when finding a time that works for multiple people. \n\n\n\n
- Overlay view — all selected calendars are merged into a single view with events colour-coded by calendar. This gives a clear picture of your combined schedule. To switch to overlay mode, click the arrow icon at the top of a side-by-side calendar column. \n
Managing calendar visibility well is also important if you have time away planned. Setting your status correctly on shared calendars, combined with an out-of-office message, keeps colleagues informed automatically — our guide on how to set an out-of-office reply in Outlook covers the full process.
\n\n\n\nFrequently Asked Questions
\n\n\n\nCan I share my Outlook calendar with someone outside my organisation?
\n\n\n\nYes, but with limitations. When you add an external email address in the sharing invitation, the recipient receives a link to view your calendar in a browser rather than seeing it integrated into their own Outlook. The level of detail visible to external recipients is also controlled by your organisation’s Microsoft 365 settings — your IT administrator may have restricted external calendar sharing.
\n\n\n\nHow do I stop sharing my calendar with someone?
\n\n\n\nGo to your Calendar view, right-click your calendar in the left panel, and select Properties. Open the Permissions tab. You will see a list of everyone you have shared the calendar with. Select the person you want to remove and click Remove, then click OK. Their access is revoked immediately and the calendar will disappear from their Outlook the next time it syncs.
\n\n\n\nCan I edit someone else’s calendar events if they shared their calendar with me?
\n\n\n\nOnly if they granted you Can edit or Delegate permissions. If you only have view-level access, you can see the events but not modify them. If you need edit access, the calendar owner will need to update your permissions through their Calendar Properties panel.
\n\n\n\nWhy can’t I see events on a shared calendar that has been added to my Outlook?
\n\n\n\nCheck that the calendar is ticked in your left sidebar — it is easy to accidentally uncheck it. Also verify that you have the correct permission level. If the calendar appears empty despite knowing events exist, try removing the calendar and re-adding it via Open Shared Calendar. Signing out of Outlook and back in, or clearing the Outlook cache, usually resolves persistent sync issues.
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