How to Fix Outlook Not Working on Computer
When Outlook refuses to open, freezes on the loading screen, or stops syncing your emails, it can completely disrupt your workday. Fixing this issue usually comes down to isolating software conflicts, repairing corrupted data files, or resetting your user profile.
Before you spend hours reinstalling Microsoft Office, try working through these proven troubleshooting steps in order of how quickly they can get your email client back up and running.
Run Outlook in Safe Mode
The quickest way to diagnose why Outlook is not working on your computer is to launch it in Safe Mode. Safe Mode starts Outlook without any third-party add-ins or customized extension toolbars, which are the most common culprits behind unexpected crashes and startup freezes. To launch Outlook in Safe Mode, press the Windows Key + R on your keyboard to open the Run dialog box. Type outlook.exe /safe into the text field and press Enter. A prompt will appear asking you to confirm your profile selection; click OK to proceed.
If Outlook opens successfully in Safe Mode, you have confirmed that a faulty add-in or extension is causing the crash. If it still fails to open, the issue likely stems from a corrupted data file or a deeper system error, meaning you can skip ahead to the data repair steps. Always remember to close Safe Mode before troubleshooting further to ensure your diagnostic settings apply correctly.
Disable Faulty Add-Ins
If Outlook opened successfully in Safe Mode, one of your active add-ins is likely crashing the application. To find and disable the offending add-in, open Outlook normally if possible, or restart it in Safe Mode if a normal launch is impossible. Navigate to File > Options > Add-ins at the bottom of the left sidebar. Look at the Manage drop-down menu at the bottom of the window, select COM Add-ins, and click the Go button right next to it.
Uncheck one add-in at a time from the list and click OK, then restart Outlook normally to test if the problem returns. Common troublemakers include outdated antivirus integrations, cloud storage sync tools, and legacy PDF plugins. Once you identify the specific add-in causing the crash, keep it permanently disabled or check for software updates from its developer to prevent future conflicts.
Repair Outlook Data Files
Corrupted Personal Storage Table (.pst) or Offline Outlook Data (.ost) files frequently cause syncing errors, missing messages, and sudden application crashes. Microsoft includes a built-in utility called the Inbox Repair Tool to fix these exact database corruptions. First, close Outlook completely. Open File Explorer and navigate to your Office installation folder, which is typically located in C:\Program Files\Microsoft Office\root\Office16 or a similar directory depending on your version. Look for the application named SCANPST.EXE and double-click to run it.
Click the Browse button within the repair tool to locate your faulty data file. Outlook data files are usually saved under C:\Users\YourUsername\AppData\Local\Microsoft\Outlook. Click Start to let the tool scan your file for errors. If errors are detected, make sure to check the box to make a backup before clicking Repair. Once the repair process finishes, relaunch Outlook to see if your computer runs the application without freezing.
Verify Work Offline Settings
Sometimes Outlook is not actually broken; it has simply been toggled into offline mode, preventing new emails from downloading and outgoing messages from sending. Look at the bottom right corner of your Outlook window in the status bar. If you see text that reads Working Offline or Disconnected, Outlook has lost its connection to your mail server. To fix this, click on the Send / Receive tab at the top ribbon menu.
Locate the button labeled Work Offline and click it once to toggle the connection back on. The status bar at the bottom should change to Connected to Microsoft Exchange or Connected to Server within a few seconds, and your queued messages will begin downloading immediately. If connection issues persist, check your main internet connection or restart your home router to clear any local network glitches.
Create a New Outlook Profile
If your user profile settings have become hopelessly corrupted, repairing individual data files may not be enough. Creating a brand-new Outlook profile creates a fresh environment for your email accounts. Close Outlook, click the Windows Start button, type Control Panel, and open it. Change the view category to Large icons or Small icons, then click on Mail or Mail (Microsoft Outlook). In the window that pops up, click the Show Profiles button.
Click Add to create a new profile, type a descriptive name, and click OK. Enter your email address and password following the automatic account setup wizard. Once the new profile is successfully created, return to the Mail window and select the radio button for Prompt for a profile to be used or select your new profile under Always use this profile. Open Outlook to verify that your inbox loads properly under the new configuration.
Update Microsoft 365 and Windows
Running an outdated version of Microsoft Office on a newly updated operating system frequently causes compatibility bugs that break app functionality. To ensure your software is fully up to date, open Outlook and click File > Office Account. On the right side of the page, locate the Update Options dropdown menu and click Update Now. Office will check for pending patches and install them automatically.
At the same time, check your system updates by pressing the Windows Key + I to open Settings > Windows Update > Check for updates. Installing the latest operating system patches resolves background system library conflicts that might interfere with desktop applications. After all updates finish installing, restart your computer entirely to apply the changes and launch Outlook again.
The bottom line
Dealing with a broken email client is frustrating, but systematically checking for add-in conflicts, corrupted data files, and profile issues will almost always resolve the problem. Once you apply these fixes, your Outlook should run smoothly and keep your inbox fully synchronized.
Frequently asked questions
Why does Outlook keep freezing on the loading screen?
Outlook usually freezes on startup due to corrupted data files (.ost or .pst) or conflicting third-party add-ins. Running Outlook in Safe Mode helps isolate whether an add-in is causing the freeze.
Where are Outlook data files stored on my computer?
By default, Outlook data files are stored in the AppData folder on your main drive, typically found at C:\Users\YourUsername\AppData\Local\Microsoft\Outlook.
Will creating a new Outlook profile delete my emails?
No, creating a new profile does not delete your emails from the mail server. Your messages will re-sync automatically once you sign into your account on the new profile.
How do I know if Outlook is working offline?
Look at the status bar located at the very bottom right corner of your Outlook window. If it displays Working Offline, click the Send / Receive tab and click Work Offline to reconnect.
