Are you facing the Microsoft Outlook Error 421? Do you want an effective solution to fix this error? If yes then you have come to the right destination. If you are using Outlook then you must be ready to face different kinds of error message into it. However there are several kinds of error which users can suffer in Outlook but today we are talking about Outlook Error 421. Like other error message it is also an annoying one which should be not ignored otherwise it can create serious problems. Well, users generally get this error when they are trying to send and receive emails. The main reason behind this error is the missing of the registry key which is necessary to connect Outlook during POP3 connection. You can get rid of this error by changing the settings of your exchange server. However presence of this threat for long time can lead to the corruption of PST file and other issue. If your PST file is also corrupted due to Outlook Error 421 then you can run the inbox tool to repair it. But in most of the cases the inbox tool fails to fix the corrupted PST if it is severely corrupted or corrupted due to oversize. So in that situation you can use some third party software like PST repair tool.
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