Mac computers can have relatively small hard drives like 128GB or 265GB which Outlook 2016 for Mac can gobble up. Select OK.Outlook for Mac is a disk space hog but the macOS has a way to recover some of that. You can run the /resetnavpane command to remove all customizations to the navigation pane and check whether Outlook still won’t open.Ĭlose Outlook, select Start > Run, and type Outlook.exe /resetnavpane. The navigation pane displays your folder list and icons to move.

See our in-depth guides on what to do when Outlook can’t access data files and how to repair an Outlook PST file that’s damaged or corrupted. You can use the scanpst.exe (Inbox Repair Tool) to scan your data files and repair errors.

Occasionally, some of the data (PST) files Outlook stores may become corrupted. Note: Back up your data files before removing your old profile because selecting Remove means all your offline cached content will be deleted. Select OK and check if Outlook starts normally with the new profile name.

Restart Outlook and select the new profile name you created in the drop-down list in the Choose Profile dialog box.

Next, select Prompt for a profile to be used under When starting Microsoft Outlook, use this profile and then select OK.

Select Finish and you’ll find your new profile’s name added in the Mail dialog box under the General tab.

You may also consider troubleshooting if Windows won’t install updates.

It works in the cloud-based Microsoft 365, Office or Outlook on your computer. This tool runs tests to identify problems and offers the best fixes.

Download and install the Automated Support and Recovery Assistant Tool (SaRA).

Find out also how to fix an intermittent internet connection in Windows 10 or connect your computer to a mobile hotspot when your router isn’t working. If the connection works but you can’t open Outlook, your browser or other apps, see our guide on what to do when you can connect to a wireless router but not the internet. After each step, try to open Outlook and check if it works again. Whatever the reason for Outlook not opening on your device, there are several simple and advanced troubleshooting steps you can use to fix Outlook issues.

A bug in the app, which requires an update.

There are several reasons why Outlook might not load or work correctly.

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