Article ID: 245419 - View products that this article applies to.
This article was previously published under Q245419
Microsoft offers two different e-mail programs (or clients), Microsoft Outlook and Outlook Express. Although these two programs have several similar features and often work closely together, they are different. For information about the differences between Microsoft Outlook Express and Microsoft Outlook e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/257824/EN-US/ )OL2000: Differences Between Outlook and Outlook Express
When you upgrade Outlook Express, you may experience the following symptoms.
Upgrading Outlook Express 4.x to Outlook Express 5 or LaterIf you upgrade Outlook Express 4.x to Outlook Express 5 or later, and then attempt to start Outlook Express from either the desktop icon or from Microsoft Internet Explorer, you may receive one of the following error messages or Outlook Express may not start:
Upgrading Outlook Express 5.0 to Outlook Express 5.01 or LaterWhen you upgrade Outlook Express 5.0 to Outlook Express 5.01 or later, and then attempt to start Outlook Express from either the desktop icon or from Internet Explorer, Outlook Express does not start, and you do not receive an error message.
This issue can occur if there is missing or corrupted information in the Outlook Express Identities registry key.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
To work around this issue, use the following methods in the order in which they are presented.
Rename the "Main Identity" SubkeyBefore you back up the Identities subkeys, you must rename the Username value of the Main Identity subkey. To do so:
Back up Individual Identity SubkeysFor each identity that you create in Outlook Express, an entry is automatically created in the Microsoft Windows registry. Back up these identities before you delete the Identities subkey. If you do not, you may be unable to use your current identities or shared contacts after you restart Outlook Express.
To back up your identity information:
270670After you have successfully backed up all of the individual identity subkeys, proceed to the next method.
(https://support.microsoft.com/kb/270670/EN-US/ )OLEXP: How to Back Up and Recover Outlook Express Data
Delete the "Identities" SubkeyTo delete the Identities subkey:
Re-Create Your Identities SubkeysTo re-create your Identities subkeys:
(https://support.microsoft.com/kb/209169/EN-US/ )OLEXP: How to Create and Use Identities in Outlook Express 5
Restore Your E-mail and News Account InformationAfter you finish using the preceding methods to restore your identities, you need to manually re-create your e-mail and news accounts. For more information about how to create e-mail and news accounts in Outlook Express, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/171163/ )How to configure Outlook Express 6.0 for Internet mail
171164NOTE: For questions about specific e-mail or news account settings, please contact your e-mail provider, your Internet service provider (ISP), or your newsgroup administrator.
(https://support.microsoft.com/kb/171164/ )OLEXP: How to configure Outlook Express for Internet News
Article ID: 245419 - Last Review: May 7, 2007 - Revision: 3.4