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Written By Adom Smith
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Updated on February 28th, 2026
As it is said that understanding the root cause solves half of the problem, let’s discuss why the error 500 appears in the first place.
Here, in this section of the blog, we will discuss various fixes to resolve the error 500. Try each of them one by one, and still nothing works for you, better opt for the recovery solution provided below.
As we discussed above, there might be an issue with Microsoft 365 services, which eventually leads to the Outlook Error 500. In case the server is down or under maintenance, Outlook may not work properly and display this error.
Steps to check server status are as follows:
Note: Only global administrators can use these options.
If the error appears while sending an email, large-size or multiple attachments may be the cause of this error. You can reduce the size or quantity to identify & resolve the issue. You can also use the cloud storage links as a practical alternative.
If you are using an outdated version of Outlook, it can lead to compatibility issues, which can eventually trigger Error 500. Simply update your Outlook application to have the latest fixes and improvements.
Steps to update Outlook are listed below:
Corrupted cache or cookies can interfere with the service communication. Once you clear them, all sign-in and loading errors related to Outlook Error 500 will be resolved.
Sometimes, the incompatible add-ins may also disrupt the functionality of MS Outlook & cause Error 500. On removing these add-ins, you can resolve this error.
Steps to Find the Problematic Add-in:
It is noticed a number of times that a corrupted PST file also prevents Outlook from properly reading mailbox data & settings. This breaks the synchronisation with Microsoft services and eventually triggers the Outlook Error Code 500 during email operations. Fixing these PST files can resolve this issue. Therefore, you can use the Aryson Outlook PST Repair Software to restore or recover your damaged PST files within a few seconds. This software also recovers your encrypted or password-protected PST files with the help of three different modes as on the level of corruption. Moreover, users can repair their oversized PST files using the same software. Also, users can repair PST files without using ScanPST.exe. Now, follow the steps below to recover your PST files.






Also Read: Learn How to Resolve SQL Orphaned Users Errors
In the above recovery guide, we learnt how to identify the Outlook Error 500 causes & resolve them with the help of various fixes. Along with that, we also discussed the automated recovery solution to repair the corrupted PST files, if any. With the help of various features of the software, even beginners can resolve this error effortlessly in a short time interval.
Ans- “Outlook Error 500 Mailbox not found” error usually occurs due to server outages, corrupted cache or PST files, faulty add-ins, outdated Outlook versions, or authentication and configuration issues.
Ans- Yes, corrupted or outdated browser cache and cookies can interfere with Outlook Web App, leading to Error 500.
Ans- Clear your browser cache and cookies, check Microsoft service status, disable browser extensions, and sign in again to OWA.
About The Author:
Adom Smith is a DataRecoveryHelp Technology Writer. He is a technology enthusiast with over 3 years of experience in Data Recovery, IoT, Artificial Intelligence, and Robotics. He enjoys researching and sharing DIY solutions as well as tips and tricks for resolving Windows technical issues.
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