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Outlook is a featured Microsoft application which provides various features to manage Outlook data including emails, contacts, notes, calendar entries, task, journals etc. But sometimes when you try to send emails using Microsoft Outlook account then you will receive outlook error 0x8004210e message which stops you to work on Outlook.

“Task error ‘ – Receiving’ reported error (0x8004210e): ‘Your mailbox is temporarily unavailable because another e-mail message is being delivered to it or other mail application is using it. The server responded: File is busy try again or ERROR box is locked”


After having this numeric error code you become unable to send or receive emails. Error message pop up on the screen while accessing Outlook data. This problem may cause due to virus infection. Sometimes while receiving or sending emails, these messages get infected by virus and when you try to perform the process then it starts generating outlook error 0x8004210e messages. Using same email id on the other system at the same time may also cause this type of issue while using Outlook emails service.

Antivirus of the PC also interrupts in the mailing function of Outlook. Until you disable Antivirus function it doesn’t work properly and stops you to send emails. Getting Outlook error 0x8004210e continuously may cause critical condition for your saved PST files. It may corrupt PST files which makes you unable to access Outlook data.

If you are getting Outlook error 0x8004210e on your computer screen then you would have to follow below solutions.

  • Check your email id that no any other users is using same email id if someone using the same id then stop them to access. It will solve your problem. You need to delete all the temporarily internet files and cookies to prevent from outlook error.
  • Disable used Antivirus software because Antivirus stops users to send or receive emails when you use attachments files with your mail. So it is better to disable Antivirus action before sending or receiving emails.
  • If Outlook files become inaccessible then it might be corrupt and to fix corrupt PST files use reliable PST repair tool.

Outlook error 0x8004210e easily solved when you repair your corrupted and damaged PST files using effective third party PST repair software. This professional tool specially designed to fix Outlook 0x8004210e error. It scans infected files automatically and repair damaged data in few clicks.

Fix Outlook Error 0x8004210e

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