Rectify MS Outlook 0x8004210E Error

In Microsoft Outlook PST file user can easily store many important files and folders like email, contacts, calendars and more important things. Besides it has many powerful and advanced features but it is also very prone to corruption and due to this reason user encounters 0x8004210E Error in MS Outlook. This error message generally occurs at the time of sending or receiving the e-mail. This error clearly indicates that the there is some problem in mail server and due to which user is unable to receive or send e-mail. This error message is shown as displayed below:

"Task ' - Receiving' reported error (0x8004210E): 'Your mailbox is temporarily unavailable because another e-mail message is being delivered to it or another mail application is accessing it. The server responded: -ERR box locked"

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Basically this error message occurs when MS Outlook becomes unable to access the mail server. Not only this but there are many more reason responsible for this error message, they are discussed below:

  • The mail server that is being tried to access is already a open connection for your mail connection. And due to this reason the mail server does not allow other users for its connection.
  • Due to some unwanted or malicious email that is available in your mail server and presently using the resources of mail server. Due to this email malicious items server stops further connection.

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Due to this situation it becomes important to repair the error problem in Outlook. So for that at first check that if you are using any other device like iPhone, iPod and any other device then stop doing that and simply close the connection and retry. On the other hand sometimes while performing scanning by antivirus application mail server is open in the antivirus scanning procedure. So it is important to stop the antivirus scanning. After that restart your system and open outlook again. If the problem is still happening then start your antivirus and perform next step. Or check the unwanted email attachment and simply delete them from the list.

In case 0x8004210E Error still persists even after following the above mentioned steps then you need to use third party Outlook PST Repair Tool. This tool has been specially designed to repair and resolve 0x8004210E Error message from MS Outlook and then make MS Outlook .pst file accessible again.