How To Sign Out Of Outlook On Mac

Signing out of Outlook on a Mac is not always as intuitive as it should be. Unlike many applications where a simple "Log Out" button sits prominently in a menu, Microsoft Outlook for Mac often hides this function behind profile management settings or requires a complete removal of the account depending on the version you are running. Whether you are switching to a new Microsoft 365 account, handing your device to a colleague, or simply troubleshooting a persistent sync error, knowing the correct method for your specific build is essential to avoid data loss or configuration headaches That's the whole idea..

Understanding the Two Outlook Experiences on Mac

Before diving into the steps, it is critical to identify which version of Outlook you are using. Microsoft currently maintains two distinct experiences on macOS, and the sign-out process differs significantly between them.

Classic Outlook for Mac is the legacy version familiar to long-time Office users. It features a traditional menu bar structure and manages accounts through a dedicated "Accounts" preferences pane. New Outlook for Mac (often labeled simply as "Outlook" with a "New Outlook" toggle in the top-right corner or installed via the Mac App Store as a separate app) shares a codebase with the Windows and Web versions. It uses a modern, simplified settings interface that resembles the Outlook Web App (OWA).

If you see a toggle switch in the top-right corner of the window labeled "New Outlook," you are on the modern version. If that toggle is absent or turned off, you are on the Classic version. The following sections cover both scenarios in detail.

How to Sign Out of New Outlook for Mac

The modern iteration of Outlook treats "signing out" as the removal of the account from the application. There is no persistent session token stored separately from the account configuration. That's why, to sign out, you must delete the account from the app. Do not worry—this does not delete your emails, calendar, or contacts from the Microsoft server; it only removes the local cache and connection from this specific device Most people skip this — try not to..

1. Open Outlook on your Mac.
2. Click the Outlook menu in the top-left corner of the screen (next to the Apple logo).
3. Select Settings (or Preferences on slightly older builds).
4. In the Settings window, click Accounts in the left sidebar.
5. Select the account you wish to remove from the list on the left.
6. Click the three dots (More options) button next to the account name or at the bottom of the account details pane.
7. Choose Delete Account (sometimes labeled Remove Account).
8. A confirmation dialog will appear warning you that the account will be removed from this device. Click Delete or Sign Out to confirm.

Once completed, the account disappears from the sidebar. Practically speaking, if this was the only account configured, Outlook will return to the initial welcome screen, prompting you to add an account. This effectively signs you out completely.

Important Note: If you have "On My Computer" folders (local archives not synced to the cloud), ensure you have backed them up before removing the account, as local data can be lost during this process if not exported first Which is the point..

How to Sign Out of Classic Outlook for Mac

Classic Outlook offers a slightly more granular approach. Worth adding: you can either remove the account entirely (similar to the New version) or simply take the account "Offline" if you want to stop syncing without losing the configuration. On the flip side, a true sign-out requires removal Easy to understand, harder to ignore..

1. Launch Outlook.
2. Click the Outlook menu in the menu bar.
3. Select Preferences (or press Command + ,).
4. Click on the Accounts icon (usually the first icon in the top row).
5. In the left pane, select the Exchange, Microsoft 365, or Outlook.com account you want to sign out of.
6. At the bottom of the left pane, click the minus (-) sign.
7. A dialog box will ask: "Are you sure you want to remove this account? All messages, contacts, and other data for this account will be deleted from this computer."
8. Click Delete (or Sign Out if prompted specifically for Microsoft 365 accounts).

For IMAP or POP accounts, the process is identical. That said, if you are using an older version of Classic Outlook (pre-2019), you might see a "Sign Out" button directly in the account details pane on the right side after selecting the account, rather than using the minus button.

The "Nuclear Option": Clearing Caches and Keychain Entries

Sometimes, simply removing the account via the UI isn't enough. macOS stores authentication tokens in the Keychain Access app, and Outlook stores local database caches in the user Library folder. If you are trying to sign out to fix a login loop, a "stuck" password prompt, or to ensure no residual credentials remain for security reasons, you must clear these manually But it adds up..

Clearing Keychain Credentials

1. Open Keychain Access (press Command + Space, type "Keychain Access", hit Enter).
2. In the search bar (top right), type Exchange, Microsoft, Office, or Outlook.
3. Look for entries named "Microsoft Office Identities Settings 2," "Microsoft Office Ticket Cache," or entries containing your email address with the kind "Internet Password" or "Application Password."
4. Right-click (or Control-click) each relevant entry and select Delete.
5. Authenticate with your Mac user password if prompted.

Removing Local Cache Folders (Classic Outlook)

Classic Outlook stores its database in a hidden folder. Deleting this forces a fresh download of mail upon next login, effectively wiping the local session Took long enough..

1. In Finder, press Command + Shift + G (Go to Folder).
2. Paste the following path and hit Enter: ~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/
3. Inside, you will see a folder named Main Profile (or a custom name). Move this folder to the Trash.
   • Warning: This deletes all local emails, contacts, and calendar data for all accounts in that profile. Only do this if data is synced to the server (Exchange/Outlook.com/IMAP) or you have a backup.

Removing Local Cache Folders (New Outlook)

New Outlook uses a different container structure.

1. Press Command + Shift + G in Finder.
2. Paste: ~/Library/Containers/com.microsoft.Outlook/Data/Library/Application Support/Microsoft Outlook/
3. Delete the Profiles folder or the specific profile folder inside.

Signing Out via the Microsoft 365 Portal (Remote Sign-Out)

If you no longer have physical access to the Mac—perhaps you sold it, lost it, or left a job—you can remotely revoke the session. This forces Outlook on that Mac to sign out the next time it attempts to sync That's the part that actually makes a difference..

1. Go to account.microsoft.com or myaccount.microsoft.com in any browser.
2. Sign in with the Microsoft account you want to secure.
3. handle to Security > Sign-in activity or Devices.
4. Find the Mac device in the list (it will usually show the device name and "macOS").
5. Click Sign out or Remove device.
6. Confirm the action.

This invalidates the refresh tokens stored on that Mac. The user will be prompted to re-authenticate immediately or upon the next app launch.

Troubleshooting Common "Stuck" Sign-Out Issues

The "Account is Used by Another App" Error

macOS often prevents

the deletion of a keychain item if it's believed to be in use by an active application. To resolve this:

1. Quit all Microsoft Office applications completely. Don't just close the window; go to the menu bar and select Quit (e.g., Quit Outlook, Quit Word).
2. Open Activity Monitor (search with Spotlight).
3. In the search bar, type "Office" or "Outlook".
4. Select any processes listed and click the Force Quit button (the octagonal stop icon).
5. Once all processes are stopped, retry deleting the keychain entries.

Outlook Continuously Re-signs In

If Outlook keeps re-establishing the session after you've cleared credentials, it may be due to a sync extension or a background daemon Most people skip this — try not to..

1. Go to System Settings > General > Login Items.
2. Remove any items related to Microsoft Office, Outlook, or Microsoft AutoUpdate.
3. Check System Settings > Privacy & Security > Extensions. Disable any Microsoft-related extensions, particularly sync or file provider extensions.

Cache Deletion Fails

If you cannot move the profile folders to the Trash, it's likely because a file within them is locked by an open process. Ensure you have fully quit Outlook and any other Office apps, including background apps like OneDrive or OneNote, and then try again. Using Force Quit on all related processes in Activity Monitor as described above is the most reliable method The details matter here..

Conclusion

Successfully signing out of Outlook on a Mac involves a multi-layered approach, targeting the application's session, its local data caches, and its stored authentication credentials. Always remember that the most secure method is to use the official "Sign Out" function within the Outlook application first. On top of that, by systematically clearing these components—whether through the application's own settings, by manually removing cache folders, or by deleting keychain entries—you ensure a complete break from the Microsoft 365 account. For situations where physical access is no longer possible, the remote sign-out via the Microsoft account portal is a critical security measure. The manual steps detailed here serve as essential troubleshooting measures for stubborn sessions or for completely purging account data before handing over or decommissioning a Mac.