SYMPTOMS

Outlook does not start and an error message appears

"Cannot start Microsoft Office Outlook, MAPI32.dll is corrupt or the wrong version. This could have been caused by installing other messaging software. Please reinstall Outlook." 

Uninstalling and reinstalling from my original Microsoft Office 2003 Outlook does not work. 

CAUSE

Resolution

1)Quit Outlook.

2)Click Start, point to Find, and then click Files or Folders.

3)Type Mapi32.dll in the Named box.

4)In Look In, click to select My Computer, and click Find Now.

5)Right-click to select Mapi32.dll and msmapi32.dll in the search results list.

6)Click Rename both files If there are multiple copies of Mapi32.dll and msmapi32.dll  in the list, rename each.

7)Close the Find Files window and start Outlook.

When you start Outlook, it checks for the existence of necessary files. 

In the case of Mapi32.dll, if it is not present at startup, Mapistub.dll is used. If for any reason Mapistub.dll cannot be found, Setup automatically attempts to replace both files.

Can't find an Answer Use Google below to search furthure.