Outlook 365 Error Something Went Wrong [1001]

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Recently had a client who would receive a generic Microsoft Error message: “Something went wrong. [1001]

Despite it be obviousness that an error occurred, what specifically occurred (in typical Microsoft fashion) is not. In most cases it seems that the error is related to a simple login caching error.

In this article I provide a simple set of instructions which may assist you with resolving this Outlook 365 Something Went Wrong [1001] error.


Microsoft Outlook 365 Error Something Went Wrong [1001]


Microsoft Something Went Wrong Error [1001]

The steps below should help you resolve your Something Went Wrong error when opening Outlook 365.

  1. Close out of all open Microsoft applications; Office, Teams, etc.
  2. Open “File Explorer” and navigate to your users’ “\AppData\Local\Microsoft” folder.
    • Note the “AppData” folder is hidden, you can just append it to your File Explorer navigation bar.
    • Example: “C:\Users\(YOUR-USERNAME-HERE)\AppData\Local\Microsoft
      • Replace (YOUR-USERNAME-HERE) with…. your PC username.
  3. Move both the “OneAuth” and “IdentityCache” folders to your desktop.
  4. Relaunch Outlook 365 and try to sign in. The Something Went Wrong Error should now be now be fixed.
    • If not, close Outlook and move the “OneAuth” and “IdentityCache” folders back into the Microsoft folder (see Step 2).
    • When it asks if you want to overwrite the “OneAuth” and “IdentityCache” folders, select “NO“.
  5. Relaunch Outlook 365 and sign in. The issue should now be resolved.

If you would like remote support on this issue, don’t hesitate to give me a call or drop me an email request.



I hope my article on solving the generic Microsoft Error, Something Went Wrong [1001] has helped you. I welcome your thoughts, questions or suggestions regarding this article.

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