Navigate the the location below in your registry and make the corresponding change.

If you delete the value of 'WindowTitle' the title will be changed back to its default. 

For Outlook Express 5.x use Key:[HKEY_CURRENT_USER\Identities\%NUMS%}\Software\Microsoft\Outlook Express\5.0] 

 %NUMS% should be a long string of characters such as: {4A8A549F-9E46-469D-B39E-2826549159AA} 

Key:[HKEY_CURRENT_USER\Software\Microsoft\Outlook Express]
Value Name: WindowTitle
Data Type: REG_SZ

 

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