How to Share a Custom Calendar in Microsoft Outlook

To share a custom calendar in Outlook, select the calendar, open its sharing controls, add the recipient’s email address, and choose what they’re allowed to see or change. You’ll need an Outlook account and a calendar stored in a Microsoft 365, Exchange, or Outlook.com account; a calendar saved only on your computer may not be shareable.

What You’ll Need

An Outlook.com, Microsoft 365, or Exchange account that supports calendar sharing. If you use Outlook with Gmail, Yahoo, or a POP/IMAP account, calendar sharing may need to be managed through that provider instead.
The email address of each person you want to invite. They may need to accept a sharing invitation before the calendar appears in their Outlook.
A custom calendar saved under the supported account. If you have not made one yet, create it in that account rather than in a local-only data file.
Permission to share calendars. In a work or school account, your organization’s administrator may restrict sharing, particularly with people outside the organization.

Step-by-Step

Open the calendar you want to share. In Outlook, switch to Calendar and look in the calendar list for the custom calendar. Make sure you select the secondary calendar you intend to share, not your main calendar. If you have not created it, use Add calendar > Create blank calendar in new Outlook or Outlook on the web, then choose the account where it should be stored. In classic Outlook for Windows, use Home > New Calendar if that command is available in your setup. Give the calendar a distinctive name so you can identify it in the sharing dialog.
Check that it belongs to the right account. Expand the calendar list and note the account heading above the calendar. A calendar under a Microsoft 365, Exchange, or Outlook.com mailbox is generally the right kind to share. A calendar under a local computer folder or a PST data file may not have cloud sharing controls. If the calendar was created under the wrong account, create a new one under the supported mailbox and copy or move the events into it, checking the destination before sharing.
Open the sharing controls for that calendar. In new Outlook for Windows or Outlook on the web, right-click the calendar’s name in the left-hand list and choose Sharing and permissions or the similarly named sharing option. You can also select the calendar and look for Share on the toolbar. In classic Outlook for Windows, select the calendar, then choose Home > Share Calendar. In Outlook for Mac, control-click the calendar name and choose Sharing Permissions when available; the exact label can vary by account and Outlook version. Confirm the calendar name in the window before continuing.
Add the people who should have access. Type a recipient’s email address in the sharing field. Choose the matching contact suggestion if Outlook offers one, or finish entering the full address. Add people one at a time if you want to give them different permissions. For a group that should all have the same access, you can enter the group address if your organization permits it. Check each address carefully: a sharing invitation can expose event information to the wrong person if it is sent to a mistyped or outdated address.
Choose the right permission level. Available choices depend on the account and Outlook version. Common options include seeing only when you are busy, seeing titles and locations, seeing all event details, or editing the calendar. Choose the least access that meets the recipient’s needs. Someone who only needs to know when you are unavailable does not need to see private event details. Give edit access only to people who should be able to create, change, or delete events. In classic Outlook, the sharing invitation may have a Details selector; for additional permission controls, open the calendar’s permissions settings and choose a permission level there.
Review the invitation and send it. Check the calendar name, recipient addresses, and permission level before sending. In classic Outlook, the share invitation can include a message; select the details level in the invitation if prompted, then choose Send. In new Outlook or Outlook on the web, save or send the sharing change using the button shown in the sharing panel. The recipient normally receives an email invitation with instructions to add or open the shared calendar. If Outlook asks you to confirm a permission change, read the notice before approving it.
Ask the recipient to accept and check access. The recipient should open the invitation while signed in to the account that was invited and accept or add the calendar. They may need to refresh Outlook or switch to Calendar before it appears in the list. Confirm they can see only the information you intended them to see. If you granted editing access, ask them to make a harmless test entry and confirm that it appears for you, then remove the test entry. This catches account or permission mismatches before the calendar is relied on.
Change or remove access when circumstances change. Return to the same calendar’s sharing or permissions panel to adjust a person’s permission or remove them. In classic Outlook, use the calendar’s permissions settings; in new Outlook or on the web, open Sharing and permissions. Removing someone stops future access, but it cannot retract details they already copied, downloaded, or saw. If the calendar contains sensitive information, review its events and sharing list periodically rather than assuming an old invitation is still appropriate.

Common Mistakes

Sharing the wrong calendar: Outlook can show several calendars together, so it is easy to select your main calendar instead of the custom one. Check the calendar name in the sharing window before sending. If you shared the wrong one, remove the recipient from that calendar’s permissions, then share the intended calendar separately.

Choosing broader access than necessary: Full event details may include locations, notes, meeting links, or attendee information. Editing permission can let someone change or delete events. Match access to the task and avoid granting edit rights just because a recipient needs to view your schedule.

Assuming a sent invitation means access is active: The recipient may still need to accept the invitation, use the invited account, or add the calendar. Ask them to check their inbox and junk folder, then confirm the calendar is visible in their calendar list.

Trying to share a local or third-party calendar through Outlook: A calendar shown in Outlook is not necessarily hosted by Microsoft. If its sharing controls are missing, identify which account owns it and use that provider’s sharing feature if needed. Importing or copying events into a cloud calendar can be an alternative, but review recurring events and time zones afterward.

Tips

Use a clear name such as “Project schedule” or “Family appointments” so invitees can distinguish the calendar from their own.
Give each person an individual permission level when their responsibilities differ. For example, a coordinator might need edit access while a wider team only needs to view details.
Keep private appointments private where your Outlook version supports marking events as private. Do not assume that a calendar permission setting hides every sensitive detail in every client; verify the view using a test recipient or account when privacy is important.
Tell recipients which email account you invited. A person signed in to a different personal or work account may not see the calendar even if they have accepted the message.
For a shared work calendar, agree on who owns event changes and how cancellations are handled. Two people editing the same event at once can lead to conflicting updates or confusion.
Sharing is different from publishing a public calendar link. Use individual sharing for named people and check with your organization before making a calendar accessible through a link.

Troubleshooting

The sharing option is missing or unavailable. Verify that the selected calendar is stored in a Microsoft 365, Exchange, or Outlook.com mailbox, not in a local folder or an account whose provider handles calendars separately. Try Outlook on the web by signing in to the owning account and opening Calendar. If it is a work or school account, ask your Microsoft 365 administrator whether external sharing or calendar permissions are restricted.

The recipient did not receive the invitation. Confirm the address and resend the invitation if necessary. Ask the person to check junk mail and any quarantine or filtering system used by their organization. They should search for the calendar name and the sender’s address, then open the invitation using the account that was addressed. If the address was wrong, remove that entry from the permissions list before inviting the correct person.

The recipient accepted, but the calendar is not visible. Have them open the invitation again and use its add-calendar option, then refresh Outlook or close and reopen Calendar. They should check the calendar list for a collapsed section or an unchecked calendar. In a work environment, a delay in synchronization can occur; allow a short time, then sign out and back in if needed. If access still fails, remove and re-add the permission and confirm that the invited account matches the account they are using.

The recipient can see busy times but not event details. That usually means the permission is intentionally limited to availability. Return to the sharing settings and raise the permission only if the person needs more information. Some organizations apply additional restrictions, and private events may remain limited even when broader calendar access is granted. Test with one event that contains no sensitive information before changing access for a large group.

The recipient cannot edit events. Check that their permission is set to an editing level, not view-only, and that they accepted the invitation. Ensure you changed permissions on the custom calendar itself rather than your main calendar. If the setting is correct but changes are blocked, the account type or organization policy may prevent editing; ask the administrator or use an approved shared mailbox or group calendar for collaborative scheduling.

The Mac or Windows instructions do not match your screen. Outlook’s interface varies between classic Outlook, new Outlook, Outlook on the web, and account types. Look for the selected calendar’s context menu, a Share button, or a Sharing Permissions command. If none appears, confirm which account owns the calendar and whether you are online. Avoid changing unrelated mailbox permissions while searching for calendar sharing controls.

Frequently Asked Questions

Can I share only a custom calendar, not my main Outlook calendar?

Yes. Select the specific secondary calendar in the calendar list and open its own sharing settings. Confirm the calendar name in the sharing panel before adding recipients, since sharing a calendar does not automatically share every calendar in the mailbox.

Can someone edit a custom calendar I share?

Often, yes, if the account and organization allow it and you grant an editing permission. The recipient must accept the invitation and open the shared calendar. Editing access is broader than viewing access, so give it only to people expected to manage events.

Can I share an Outlook calendar with someone who does not use Outlook?

They may be able to open a shared calendar using a supported Microsoft account or compatible calendar app, but the experience and available permissions vary. Invite the email address they can access, and ask them to follow the invitation’s instructions. A Gmail or other address alone does not guarantee that the recipient can use every Outlook sharing feature.

Can I share a calendar with someone outside my organization?

Sometimes. Microsoft 365 administrators can restrict external sharing, and the recipient’s account or organization can also affect access. If the external-sharing option is absent or the invitation is rejected, contact your administrator rather than making the calendar public as a workaround.

How do I stop sharing a custom calendar?

Open that calendar’s sharing or permissions panel, find the person, and remove their access or reduce their permission. The person may retain information already viewed or copied, but they should no longer receive ongoing access after the change takes effect.

Try it: the Date Difference Calculator: days, months, years and weekdays between two dates, with the DATEDIF formulas.

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