Error message when you try to start Outlook 2003: "MAPI32.DLL is corrupt or the wrong version"

When starting your Outlook 2003, you got this error "Cannot start Microsoft Office Outllok. MAPI32.DLL is corrupt or the wrong version. This could been caused by installing other messaging software. Please reinstall Outlook.

Searching Microsoft knowledgebase, and found this solution:
This issue may occur if you install and then uninstall Microsoft Office Outlook 2007 Beta 2 on a computer that has Outlook 2003 installed. When you uninstall Outlook 2007 Beta 2 version, the Outlook 2007 Beta 2 version of the MSMapi32.dll file is not removed from the following folder on your computer:


C:\Program Files\Common Files\System\Msmapi\LocaleID
To resolve this issue, follow these steps:


Start Windows Explorer.
Locate and then open the following folder on your computer:

C:\Program Files\Common Files\System\Msmapi\1033

Right-click the MSMapi32.dll file, and then click Rename.
Note The file (Msmapi32.dll) that you are renaming differs from the file (Mapi32.dll) that is mentioned in the error message.
Type Msmapi32.old, and then press ENTER to rename the file.
Start Outlook 2003.

Note When you start Outlook 2003, the program will repair itself.
 
Reference:
Microsoft (2010). Error message when you try to start Outlook 2003: "MAPI32.DLL is corrupt or the wrong version". Retrieved on March 27, 2010 from Microsoft Knowledgebase websiteL http://support.microsoft.com/kb/926196