How to Solve Olmapi32.dll Error

Olmapi.dll is a file that belongs to outlook programme. It is vital for outlook to run smoothly and can cause below error if it is corrupted or missing:


“The file OLMAPI32.DLL is incompatible with Microsoft Outlook. Install Outlook again".


To fix this issue, we can either try to repair office/outlook or replace the dll file with a compatible one, or try to edit the corrupted registry.


How to repair Outlook:

  1. Click Start.
  2. Click Control Panel.
  3. Double click Add or Remove Programs.
  4. Select Office 2007 in the currently installed programs list, and then click the Change button.
  5. Select Add/Remove Features.
  6. Click Continue.
  7. Click on the first option and select Run All on My Computer.
  8. Follow the on screen instructions to complete the installation process.


How to replace the dll file:

  • Close all open applications.
  • Restart Windows in Safe Mode.
  • Use the built-in search utility to look for msmapi32.dll.
  • Right-click msmapi32.dll, click rename, type msmapi32.old, and then press Enter to rename the file.
  • Install Outlook.


How to edit the registry

  1. Exit Outlook 2007.
  2. Click Start>Run.
  3. Type regedit in the Open box and then press Enter.
  4. In the registry editor window, click Edit>Find.
  5. Type olmapi32.dll in the ‘Find What’ box, and then click Find Next.
  6. Locate and click HKEY_CLASSES_ROOT\Installer\Components\613 B99D5CFD 7FCB4793B500086BB4113 (Note: the last string of numbers may vary). If you don’t see the entry the first time, continue to press F3 until you locate an entry same/similar to the one shown above.
  7. Locate and select olmapi32.dll in the right-pane of the registry editor window, and then click Delete.
  8. Close Registry Editor.
  9. Open Outlook 2007.


Additional advice: Virus and malware can corrupt the registry and cause numerous problems in your computer, including the dll error. System optimizer can detect and clean these registry issues for you. Any delay will lead to unimaginable more serious issues. Remember, 90% of the computer problems are caused by registry issues. So it is always recommended that you install a registry cleaner to consistantly protect your system.