Office Outlook 2003: Can’t run due to MAPI32.DLL corrupt or wrong version!

Firstly: If you have both Office 2007 and 2003 installed make sure that Outlook 2003 has been un-installed. I have seen both Outlook 2003 and 2007 installed at the same time this usually occurs when Office 2007 comes pre-installed and then you install Office 2003 additionally. If this scenario does occur then both Office 2007 and 2003 need Outlook to be un-installed and then the relevant one being re-installed.

Secondly: If you receive a message that you are using the wrong version of mapi32.dll or that the file is corrupted, you might have installed other messaging software after you installed Microsoft Outlook.

When you see this type of message, you can fix it by running a program in the Microsoft Windows System folder.

To run the program to fix this problem, in C:\winnt\system32 or C:\windows\system32, double-click Fixmapi.exe.

Thirdly: you can try renaming MAPI32.DLL to MAPI32.old and then opening outlook, it may ask for the Office disk when opening outlook so be aware you may need this.

Anyone of these 3 options should resolve this problem.

How can I change the CD Key of my Office XP / 2003 / 2007 installation?

1. Locate your valid product CD Key, which is located on the back of the original CD case.

2. On the Start menu, click Run.

3. In the Open box, type Regedit, and then click OK.

4. In Registry Editor, find the following subkey:


Click the plus sign (+) next to this folder. If you see only one subkey in this folder that has a 32-character {GUID} (globally unique identifier), select that subkey and go to step 5.

If you see more than one subkey that has a 32-character {GUID}, select each one until you find the one whose DisplayName value (in the right pane) matches your version of Office.

5. For the selected {GUID} subkey, select the ProductID string value in the right pane.

6. On the Edit menu, click Rename.

7. Type OldProductID and then press ENTER.

8. On the Registry menu, click Exit.

9. Start any Office program.

10. When the Microsoft Office XP User Information dialog box appears, type your valid product CD Key (located on the back of the CD case). Follow the instructions on your screen.

“If you open MS Word and it does not ask you for a CD Key, go to step 11.”

11. Return to step 4, select the Registration folder.

12. Change the value if key “ProductID” to “OldProductID”

13. Delete the key DigitalProductId

14. Follow steps 8 – 10.

“If you open MS Word and it still does not ask you for a CD Key, go to step 15.”

15. Return to step 4, select the Registration folder.

16. Right click Registration folder and select rename.

17. Type OldRegistration and press enter.

18. Follow steps 8 – 10.


“Always backup your registry before making any changes, this site will not be responsible for any data loss you may incur.”