Published 2023-08-14 by TechNet New England
When Outlook stops connecting, it usually falls into one of a few categories: network issues, authentication problems, profile corruption, or add-in conflicts. This guide covers the most common scenarios and their fixes. ## Check the Basics First Before troubleshooting Outlook itself: 1. **Is your internet working?** Open a browser and try loading a website. If the browser does not work either, the problem is your network connection, not Outlook. 2. **Can you access email through the web?** For Microsoft 365, go to [outlook.office.com](https://outlook.office.com) and sign in. For Google, go to [mail.google.com](https://mail.google.com). If webmail works but Outlook does not, the issue is with the Outlook application. 3. **Is Microsoft 365 having an outage?** Check [status.office.com](https://status.office.com) for service health. ## Fix 1: Restart Outlook in Offline Mode Toggle Sometimes Outlook gets stuck in offline mode. 1. Open Outlook. 2. Click the **Send/Receive** tab in the ribbon. 3. Look at the **Work Offline** button. If it is highlighted/pressed, click it to go back online. 4. Check the status bar at the bottom of Outlook. It should say "Connected to: Microsoft Exchange" or show your server name. ## Fix 2: Repair Your Outlook Profile A corrupted profile is one of the most common causes of Outlook connection issues. 1. Close Outlook completely. 2. Open **Control Panel** (press Win + R, type `control`, press Enter). 3. Click **Mail** (or search for "Mail" in Control Panel). 4. Click **Show Profiles**. 5. Select your profile and click **Properties**. 6. Click **Email Accounts**. 7. Select your email account and click **Repair**. 8. Follow the prompts and let the repair complete. 9. Restart Outlook. ## Fix 3: Create a New Outlook Profile If repair does not work, creating a fresh profile often resolves persistent connection issues. 1. Close Outlook. 2. Open **Control Panel > Mail > Show Profiles**. 3. Click **Add** and give the new profile a name. 4. Enter your email address and follow the setup wizard. 5. Once the new profile is created, set it as the default. 6. Open Outlook. It will use the new profile and re-download your email from the server. Your old emails are not lost. They are stored on the server (for Microsoft 365 and Exchange accounts). The new profile simply re-syncs them. ## Fix 4: Clear Cached Credentials Windows may be holding onto old or expired credentials for your email account. 1. Close Outlook. 2. Open **Credential Manager** (press Win + R, type `control keymgr.dll`, press Enter). 3. Click **Windows Credentials**. 4. Look for entries that contain "outlook," "office," "microsoftonline," or your email domain. 5. Click each one and select **Remove**. 6. Restart Outlook and sign in again when prompted. ## Fix 5: Disable Add-ins A bad add-in can prevent Outlook from connecting. 1. Open Outlook in Safe Mode: press **Win + R**, type `outlook.exe /safe`, press Enter. 2. If Outlook connects normally in Safe Mode, the problem is an add-in. 3. Go to **File > Options > Add-ins**. 4. At the bottom, select **COM Add-ins** and click **Go**. 5. Uncheck all add-ins and click **OK**. 6. Restart Outlook normally. If it works, re-enable add-ins one at a time to find the problem one. ## Fix 6: Update Outlook Outdated Outlook versions can have known bugs that cause connection issues. 1. Open Outlook. 2. Go to **File > Office Account > Update Options > Update Now**. 3. Let the update complete and restart Outlook. ## When to Contact IT Support If none of the above fixes resolve the issue, the problem may be: Server-side (Exchange or Microsoft 365 configuration). MFA or conditional access policy blocking the connection. Firewall or proxy blocking Outlook's connection to the mail server. A license issue on the Microsoft 365 account. These require administrator-level access to diagnose and resolve.