Outlook Error 1001: Use These 5 Solutions to Fix it

Your registry configuration usually causes this error message

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Updated onDecember 4, 2023

updated onDecember 4, 2023

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Key notes

Outlook error 1001 will prevent you from using Outlook on your PC, and this can be a problem if you’re using it for communication or to organize and plan meetings with your coworkers.

Since your email client is such an essential tool, in this guide we’re going to show you a couple of methods that you can use to fix this problem on your PC.

What is error code 1001 in Outlook?

How do I get rid of error code 1001 in Outlook?

1. Modify your registry

2. Delete OneAuth and IdentityCache folders

Some users are suggesting navigating to the following path in the Run dialog:%systemroot%\system32\AppLocker

After that, just delete all files from the AppLocker folder.

3. Use a PowerShell script

Alternatively, you can use this script instead:

if (-not (Get-AppxPackage Microsoft.AAD.BrokerPlugin)) {Add-AppxPackage -Register “$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\Appxmanifest.xml” -DisableDevelopmentMode -ForceApplicationShutdown }Get-AppxPackage Microsoft.AAD.BrokerPlugin

4. Reinstall Windows default apps

5. Use the Command Prompt to remove registry keys

How do I clear my Outlook cache?

Outlook error 1001 is one of the more seriousOutlook errors, however, the problem can be resolved by making adjustments to the registry or by deleting certain folders and letting Outlook recreate them.

Sadly, this isn’t the only issue you can encounter and many reportedAn unknown error occurred on Outlookas well asSomething went wrong Outlook error, but we tackled both of them in separate guides.

What solution did you use to fix this problem? Share your findings with us in the comments section.

Outlook Error 1001: Use These 5 Solutions to Fix it#

How do I get rid of error code 1001 in Outlook?#

1. Modify your registry#

2. Delete OneAuth and IdentityCache folders#

3. Use a PowerShell script#

4. Reinstall Windows default apps#

5. Use the Command Prompt to remove registry keys#

How do I clear my Outlook cache?#