Microsoft KB Archive/269434

= OL2000: (IMO) Error Message: &quot;Outlook Caused an Invalid Page Fault in Module Mso9.dll&quot; When You Synchronize with ActiveSync =

Article ID: 269434

Article Last Modified on 8/18/2005

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APPLIES TO


 * Microsoft ActiveSync 3.0
 * Microsoft ActiveSync 3.1
 * Microsoft ActiveSync 3.6

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This article was previously published under Q269434



NOTE: These procedures only apply if you have installed Outlook with the Internet Mail Only option. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Internet Mail Only option installed, you see &quot;Internet Mail Only&quot;.

For information about the differences between Microsoft Outlook and Microsoft Outlook Express e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:

257824 OL2000: Differences Between Outlook and Outlook Express



SYMPTOMS
When you synchronize your Handheld PC (H/PC) or Palm-size PC (P/PC) device by using Microsoft ActiveSync 3.0 or later, you may receive the following error message:

OUTLOOK caused an invalid page fault in module MSO9.DLL.

Where  is an address that may vary depending on your software instillation.



CAUSE
ActiveSync 3.0 and later require the full Messaging Application Programming Interface (MAPI) version of Outlook. This is known as Corporate or Workgroup (CW) mode. When Outlook is installed in Internet Mail Only (IMO) mode, Outlook does not have the full MAPI capabilities, so the synchronization procedure does not work.



RESOLUTION
To resolve this issue, remove your Windows CE-based device from the cable or cradle and quit all programs except Outlook. You may need the original installation source or CD-ROM during this process. To change the installation type from IMO mode to CW mode:
 * 1) On the Tools menu, click Options.
 * 2) On the Mail Delivery tab, click Reconfigure Mail Support.
 * 3) In the E-mail Service Options dialog box, click to select Corporate or Workgroup, and then click Next.
 * 4) Read the warning message, and then click Yes.
 * 5) Start Outlook. The Windows Installer starts and installs the required files.

