New Outlook Cannot Pin Shared Mailbox Folder: Fix

In the new Outlook for Windows, users often find they cannot pin a shared mailbox folder to the navigation pane. The pin icon is missing or grayed out, making it impossible to keep the folder visible. This happens because the new Outlook uses a different mailbox storage model than classic Outlook, where shared mailboxes are treated as secondary accounts rather than subfolders. This article explains why the pin option is disabled and provides two reliable methods to keep your shared mailbox folder accessible.

Why the Pin Option Is Missing for Shared Mailboxes in New Outlook

The new Outlook for Windows is built on the same web-based technology as Outlook on the web (OWA). In this architecture, shared mailboxes are not stored as subfolders under your primary mailbox. Instead, they appear as separate entries in the folder pane, but they are not treated as fully independent accounts. Because of this design, the pin icon — which is intended to keep a folder permanently at the top of the navigation pane — is disabled for shared mailbox folders.

Additionally, the new Outlook uses a different navigation model where the folder list is dynamically loaded. Pinning is a feature designed for folders within your own mailbox, not for cross-mailbox containers. Microsoft has not yet added native support for pinning shared mailbox folders in the new Outlook. However, you can work around this limitation using two methods that force the shared mailbox to behave like a regular account.

Method 1: Add the Shared Mailbox as an Account

When you add a shared mailbox as a full account, Outlook treats it the same as your primary mailbox. This gives you the ability to pin folders inside that mailbox, including the root folder itself.

1. Open Account Settings
   In the new Outlook, click File in the top-left corner. Then click Account Settings and select Account Settings again from the dropdown menu.
2. Add a new account
   In the Account Settings dialog, click the New button. A new window titled “Add an account” will open.
3. Enter the shared mailbox email
   Type the full email address of the shared mailbox (for example, shared@company.com). Click Connect. If prompted, sign in with your own credentials. Outlook will attempt to auto-discover the mailbox settings.
4. Wait for the mailbox to appear
   After a few seconds, the shared mailbox will appear as a separate entry in the left navigation pane, below your primary mailbox. Its icon will look the same as a regular mailbox.
5. Pin the folder
   Right-click the shared mailbox name in the folder pane. Select Pin to Favorites from the context menu. The shared mailbox will now appear in the Favorites section at the top of the navigation pane. You can also pin individual folders inside the shared mailbox using the same method.

Method 2: Use the Add to Favorites Context Menu

If you do not want to add the shared mailbox as a full account, you can use the Favorites feature to create a shortcut. This method does not pin the folder in the traditional sense, but it keeps the shared mailbox visible at all times.

1. Locate the shared mailbox in the folder pane
   In the new Outlook, scroll down the left navigation pane until you see the shared mailbox. It will appear under the “Shared with me” section or as a separate entry if it was added automatically.
2. Right-click the shared mailbox name
   Click the right mouse button on the name of the shared mailbox. Do not click on any subfolder inside it.
3. Choose Add to Favorites
   From the context menu, select Add to Favorites. A star icon will appear next to the mailbox name, and it will be added to the Favorites section at the top of the navigation pane.
4. Verify the favorite appears
   Look at the Favorites section. You should now see the shared mailbox listed there. Clicking it will open the mailbox directly. This favorite persists across Outlook restarts.

Note: This method only adds the root folder of the shared mailbox to Favorites. If you need to pin a specific subfolder (like Inbox or Sent Items), you must use Method 1 instead.

If the Shared Mailbox Still Cannot Be Pinned

“Add to Favorites” is Grayed Out

If the Add to Favorites option is disabled, the shared mailbox may not have been fully loaded. Close and reopen Outlook. Then wait for the folder list to refresh fully before right-clicking again. If the issue persists, remove the shared mailbox from your profile and re-add it using File > Account Settings > Account Settings > your primary account > Change > More Settings > Advanced > Add.

Shared Mailbox Disappears After Restart

Some users report that a shared mailbox added via automatic discovery disappears after restarting Outlook. To prevent this, use Method 1 to add the shared mailbox as a separate account. This creates a permanent entry in your Outlook profile that survives restarts.

Cannot See the Shared Mailbox at All

If the shared mailbox does not appear in the folder pane, you may not have been granted access. Ask your Exchange administrator to verify your permissions. Once access is confirmed, close and reopen Outlook. If the mailbox still does not appear, add it manually using File > Account Settings > Account Settings > New and entering the shared mailbox email address.

Method 1 vs Method 2: Key Differences

Item	Add as Account (Method 1)	Add to Favorites (Method 2)
Pins subfolders	Yes, any folder inside the shared mailbox can be pinned	No, only the root folder is added to Favorites
Requires separate sign-in	Yes, you must authenticate once during setup	No, uses existing permissions
Persists after restart	Yes, the account remains in your profile	Yes, Favorites are saved in your mailbox settings
Works in new Outlook only	Yes	Yes

You can now keep your shared mailbox folder visible in the new Outlook using one of the two methods above. After applying either fix, try pinning additional folders inside the shared mailbox to see if the pin icon becomes active. For advanced users, adding the shared mailbox as an account also enables features like automatic reply rules and calendar sharing that are otherwise limited in the new Outlook.