Here is some information that I found at MS Technet.
XCLN: Installing Outlook on OWA Server Causes Calendar Access Failure
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Article ID : 176744
Last Review : November 5, 2004
Revision : 1.0
This article was previously published under Q176744
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SYMPTOMS
CAUSE
WORKAROUND
APPLIES TO
SYMPTOMS
If you install a Microsoft Outlook client, version 8.03 on a Microsoft Exchange Server computer that has the Outlook Web Access (OWA) component installed, it may cause access to calendar information to be unavailable or generate Access Denied errors on OWA clients.
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CAUSE
The Outlook Client, version 8.03 installs and registers Active Messaging version 1.1. This can cause problems with Collaborative Data Objects (CDO) version 1.2 in the OWA component.
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WORKAROUND
Run the Microsoft Exchange Server Setup program and select reinstall to update CDO to version 1.2.
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APPLIES TO
? Microsoft Exchange Server 5.5 Standard Edition
? Microsoft Outlook Web Access 5.5
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