Some Windows users receive the error »The custom error module does not recognize this error» when they try to log into their Outlook mailbox. In most cases, the problem occurs in shared mailbox folders that use specially crafted web part URLs for Microsoft Outlook Web App (OWA).

What is causing the error “The custom error module does not recognize this error”?
We investigated this particular error message by looking at various user reports and the repair strategies that most affected users have put in place to fix the problem.. It turns out that there are two possible culprits that could end up causing this error message:
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One or more Outlook services are down: You may run into this particular problem in situations where one or more Outlook services are down or under scheduled maintenance. If this scenario is applicable, has no repair strategies available, other than waiting for the service to come back online.
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Cookies associated with corrupt Outlook: as reported by several users, This particular problem can also occur if your browser misinterprets one or more Outlook cookies. In this case, you can solve the problem by deleting the cookies from your browser.
If you are currently having trouble resolving this error message, this article will provide you with various troubleshooting guides. Then, you will find a collection of methods that other users in a similar situation have effectively used to solve this particular problem.
For best results, We recommend that you follow the methods in the order in which they are presented according to their effectiveness and difficulty. Possibly, one of them will help you to solve or avoid the error, no matter what scenario you are in.
Method 1: check the health status of Outlook services
The first is the first, let's make sure the matter is not out of your control. Some affected users have reported that the problem was caused by an Outlook.com maintenance window in their case. With this in mind, it is important to eliminate this possibility from your list of possible culprits.
To check the status of your Outlook services, go to this link (here) and check if your Outlook.com service has a check mark associated with it. If the Details section says “Everything is active”, then the problem is not caused by scheduled maintenance or unexpected server failure.

If this method helped you determine that the problem is not caused by Microsoft servers, proceed to the next method below.
Method 2: clear all cookies associated with Outlook
Some affected users have managed to resolve the problem after deleting the cookies associated with the Outlook OWA application in which they encountered the problem. By deleting all cookies except the one applicable to the email in question, reported that the problem »The custom error module does not recognize this error» no longer occurred.
However, the procedure to delete the cookies associated with Outlook will be slightly different depending on the browser you are using. Because of this, We have created four separate guides on how to delete Outlook cookies: para Chrome, Opera, Firefox y Microsoft Edge.
Follow the guidelines applicable to the browser in which the problem is found.
Here is a quick guide on how to do this in Chrome:
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Open Chrome and visit the Outlook web app (OWA) (here).
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Login with your Outlook account by inserting your email credentials (Username and password).
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Go to the navigation bar and click on the lock icon at the top left of the screen.
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Then click on Cookies.
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Later, systematically delete cookies from live.com, login.live.com, microsoft.com and support.microsoft.com by selecting each one and choosing Delete.
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Once all relevant cookies have been removed, restart your browser and visit the OWA application (Outlook Web App (here) again.
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and log in with your user credentials to see if the problem is resolved.

Here is a quick guide on how to do this in Opera:
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Open Opera and visit the OWA website (Outlook Web App) (here).
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Go to the navigation bar and click on the Page Information icon (balloon shape) in the upper left section of the screen.
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Click Cookies in the information menu of the website.
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Select the Cookies allowed in the Cookies in use menu. Later, systematically select cookies live.com, login.live.com, outlook.live.com and outlook.office365.com and choose Delete to get rid of all associated cookies.
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Once all cookies have been removed, restart your browser and see if the problem »The custom error module does not recognize this error» has been resolved.

Here is a quick guide on how to do this in Mozilla Firefox:
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Open Mozilla Firefox browser and visit Outlook OWA web application here.
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Go to the navigation bar and click on the lock icon, near where you can see the website address.
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In the Site Information menu, click on Clear cookies and site data (in Permissions).
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Later, select a systematic selection of cookies l ive.com, login.live.com, outlook.live.com and / or utlook.office365.com and click Remove to get rid of them.
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Once all relevant cookies have been removed, restart your Firefox browser and see if the problem has been resolved by trying to log in with your Outlook account again.

Here is a quick guide on how to do this in Microsoft Edge:
Note: Since Microsoft Edge is missing a feature that allows you to manage cookies by site, you have no choice but to delete them all.
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Open Microsoft Edge and click the action button in the upper right section of the screen. Later, click Settings in the drop-down menu that just appeared.
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Then, in the Settings menu, select the Privacy and security tab (padlock icon) in vertical menu.
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Then, go to Browsing data and click on Choose what you want to erase (in Clear browsing data).
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Within the Clear browsing data menu, check the boxes associated with cookies and saved website data, cached data and files and website permissions. Therefore, be sure to uncheck everything else before clicking Delete.
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Once all relevant cookies have been removed, restart Microsoft Edge and check if the problem has been resolved by visiting the OWA website again (here) and see if you can log in with your email credentials without encountering the problem »Custom error module does not recognize this error '.
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