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Summary: This article discusses the “0x800CCC03 USER ALREADY CONNECTED” error in Outlook Express. Possible reasons and solutions are outlined, including creating a new user account, emphasizing the importance of backing up old DBX files to prevent data loss. It also mentions using Kernel for Outlook Express for email recovery, preserving the original structure and content of emails.

Outlook Express, a legacy application in Windows Vista and previous operating systems, facilitated efficient email management. If you’re still using it, you’re likely familiar with its functionality. However, at times, when launching the application, you may encounter the following error while attempting to access your default account:



Several potential causes can lead to Outlook Express displaying the aforementioned error message:

  • You may be logged in on another machine.
  • There may be some problem in mail server due to which the server is having problem in recognizing improper disconnection.
  • In case, you are not logged in to your account then someone else may be using your account.
  • There may also be some internal problem with the user account.


To resolve the mentioned error message, you can employ the following methods:

  • Check if you are logged in on another machine. If you are logged in on another machine, close all connections, wait for 20-30 minutes, and then again try to sign into your account.
  • If there is a problem in Mail server, ask the System Administrator to stop the mail tasks executing on your account from mail server.
  • If there is some internal problem with the user account then wait for 20-30 minutes and then try again.
  • In case, the user account has been crashed or there is some problem with .DBX file then you need to create a new your account.

The steps mentioned above can assist in resolving the “0x800CCC03 USER ALREADY CONNECTED” error message. However, if you must create a new user account, you risk losing access to your existing emails and contacts, resulting in potential data loss. Therefore, before establishing a new account, it’s essential to create a backup of the old DBX file. This backup will enable you to import emails, contacts, and other data from your old account to the new one. You can find the DBX files for backup at the following location:

Drive: \Documents and Settings\Administrator\Local Settings\Application Data\Identities\ {40951167-9211-4FD0-A6D3-DAD3F585F9E1}\Microsoft\Outlook Express

Once you’ve set up a new account, simply import the DBX files into it, and your emails will be seamlessly transferred and listed in your new account.

Outlook Express email recovery is a common concern for OE users. To restore Outlook Express DBX files, users often seek specialized recovery software, such as outlook express recovery. This software efficiently retrieves emails from corrupt and inaccessible .DBX files, preserving the original mail structure, attachments, Unicode characters, images, text properties, and all other email elements.

Kernel for Outlook Express