When you try to open a file that has the .eml file name extension, the file does not open in Microsoft Office Outlook 2007. However, this file opens in Outlook Express, in Windows Mail, and in Internet Explorer.
How to obtain the hotfix
This issue is fixed in the Outlook 2007 post-Service Pack 1 hotfix package that is dated September 24, 2008. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
957909 Description of the Outlook 2007 post-Service Pack 1 hotfix package: September 24, 2008
How to enable the hotfix
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:
322756 How to back up and restore the registry in Windows
To have us activate this hotfix for you, go to the "Fix it for me" section. If you prefer to activate this hotfix yourself, go to the "Let me fix it myself" section.
Fix it for me
To fix this problem automatically, click the Fix it button or link. Then click Run in the File Download dialog box, and follow the steps in the Fix it wizard.
This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD and then run it on the computer that has the problem.