Outlook Calendar Showing Free/Busy Only: How to Show Details

If a colleague's Outlook calendar shows nothing but solid colored blocks — no titles, no location, no attendee names — you haven't missed a setting on your own account. Outlook calendar showing free busy only is almost always one of three separate causes: the sharing level the calendar owner picked when they shared with you, the default permission your organization applies to every mailbox, or a sharing policy that caps detail at the boundary between two Microsoft 365 tenants.

Which one you're dealing with depends on who owns the calendar and where they work, and each has a different fix. Two of the three aren't something you can change from your own account at all, so the fastest path is working out which cause applies before you go looking for a toggle to flip.

Before you start#

The fix lives in a different place for each of the three causes, and getting this wrong means asking the wrong person to change the wrong setting. Answer these first.

• Is the calendar owner a coworker in your own company, or someone at a different organization? That alone rules out one of the three causes.
• Did anyone explicitly share this calendar with you, or are you opening it from the global address list or a room list without ever being invited?
• Do you have Exchange admin access yourself, or will you need to ask someone who does?
• Which Outlook are you checking from — New Outlook, classic Outlook, Outlook on the web, or a mobile app? Some cache an old permission longer than others, which can make a fix look like it didn't work.

Which of the three causes applies to you?#

Match what you're actually seeing against the table below before changing anything. The middle column is the diagnosis; the right column is who has to act on it — often not you.

Fix it yourself: raise the level you gave someone#

This is the only one of the three you can fix from your own account, and only if you're the calendar's owner. If someone else owns the calendar, skip ahead and ask them — or their admin — instead.

1. 1

   Open Calendar and find Share

   In Outlook on the web or New Outlook, go to Calendar, right-click your calendar in the left pane (or use the Share button in the ribbon), and choose Share, then Calendar.

2. 2

   Add the person, or find them if they're already listed

   Type their name or email address. If they already appear in the sharing list because you shared with them before, click their existing entry to edit the permission instead of adding a second one.

3. 3

   Pick a higher permission level

   Choose 'Can view titles and locations' if they just need to know when you're busy and where, or 'Can view all details' for the full description and attendee list. 'Can edit' additionally lets them create and change events for you.

4. 4

   Save the change

   In Outlook on the web and New Outlook, the change applies immediately. In classic Outlook, right-click the calendar, choose Properties, open the Permissions tab, select the person, raise their Permission Level, and click OK.

Fix the org-wide default: what happens when nobody shared anything#

If nobody explicitly shared anything and internal calendars across the company all look this way, the cause is the mailbox's default permission — the access level Exchange grants to anyone in the organization who hasn't been individually shared with. Microsoft 365 ships this set to free/busy time only.

Changing it is a mailbox-level setting made in Exchange Online PowerShell, not from the Outlook sharing dialog, and it requires the Exchange administrator role.

1. 1

   Connect to Exchange Online PowerShell

   Run Connect-ExchangeOnline and sign in with an account that holds the Exchange admin role in Microsoft 365.

2. 2

   Check the current default permission

   Run Get-MailboxFolderPermission -Identity [email protected]:\Calendar -User Default. AccessRights showing AvailabilityOnly means free/busy only is the current default for that mailbox.

3. 3

   Raise it for the mailboxes that need it

   Run Set-MailboxFolderPermission -Identity [email protected]:\Calendar -User Default -AccessRights LimitedDetails for titles and locations, or -AccessRights Reviewer for full details. Repeat per mailbox, or loop it across a group of users.

4. 4

   Decide the scope deliberately

   Most organizations don't raise this company-wide for privacy reasons — it's more common to raise it for a specific team, like an executive-assistant pool or a scheduling desk, than to change it globally.

Fix cross-tenant sharing: when the calendar lives in a different Microsoft 365 organization#

Neither fix above touches a calendar hosted in someone else's Microsoft 365 tenant — a client, a portfolio company, a partner you work with daily. That boundary is governed by a sharing policy, or by an organization relationship for deeper access, and it's set by an admin rather than by the calendar owner clicking a share button.

Out of the box, Exchange Online's sharing policy allows free/busy time only across an organizational boundary — the '*:CalendarSharingFreeBusySimple' setting on a fresh tenant. Raising it to include subject and location has to happen on the policy itself, and typically needs cooperation from both organizations if you want it to work in both directions.

1. 1

   Open Organization sharing in the Exchange admin center

   Go to admin.exchange.microsoft.com, then Organization, then Sharing. The classic Exchange admin center still hosts parts of this page while Microsoft migrates it to the new admin center.

2. 2

   Create or edit a sharing policy

   Specify the external domain and the detail level: time only, time plus subject and location, or time plus subject, location, and title. Apply the policy to the mailboxes that need it.

3. 3

   Confirm the other tenant matches

   If the partner organization's own sharing policy is still capped at free/busy, raising your side alone won't show you more of their calendars — the more restrictive of the two policies wins.

Platform differences#

The three fixes above are the same regardless of platform, but where you go to make them — and what a full-detail share actually shows — varies enough to cause confusion.

What to do when it still shows only free/busy#

If you've raised the permission and it's still showing only colored blocks fifteen or twenty minutes later, work through these before assuming the change didn't save.

• Check you edited the right entry. If you were already sharing at a lower level, adding the person again can create a duplicate entry at the old level that outranks your edit.
• Ask the viewer to remove and re-add the calendar, or open it fresh in Outlook on the web, rather than waiting on their desktop client's cache to catch up.
• Confirm the meetings themselves aren't individually marked Private. A private appointment shows as free/busy to everyone except the organizer and delegates, regardless of the calendar-level permission.
• If this is a room or resource calendar rather than a person's, the resource mailbox's own default permission controls what's visible, and changing it usually needs an admin.
• For a cross-tenant calendar, double-check which side's sharing policy you actually changed. Fixing your own tenant's policy does nothing if the calendar you're viewing belongs to theirs.

A faster way: stop re-diagnosing this every time#

Every fix above is a one-time permission change, and you'll hit a version of it again with the next new hire, the next client tenant, the next partner calendar. None of it is something a mail client can override — AI Emaily only ever sees what Exchange has already decided to hand over, the same as Outlook does.

What changes once the permission is set correctly: AI Emaily keeps Gmail, Outlook, and IMAP calendars in one place, so a drafted reply that references your availability pulls from whatever detail level you're actually entitled to see, instead of you tabbing between separate sharing dialogs to remember who capped what. We build AI Emaily.