Slow performance with Microsoft Outlook when Opening emails or switching between folders

Technical Articles ID: KB86832
Last Modified: 1/27/2020

Environment

McAfee VirusScan Enterprise (VSE) 8.8 (all patched and unpatched versions)

Microsoft Outlook (all supported versions)

Problem

Opening emails or switching between folders in Outlook results in longer than normal wait times when VSE 8.8 is installed and the Email Scanner component is enabled.

Cause

Although the VSE Email Scanner appears to cause this issue, a Windows Performance Recorder Trace of the node reveals excessive wait time being consumed by Microsoft MSO.DLL.

MSO.DLL tries to use Exchange Autodiscover, but the Autodiscover infrastructure is incorrectly configured, resulting in slow performance. Adding the VSE email component only highlights the problem.

NOTE: Autodiscover is the mechanism used by Outlook to find the appropriate Exchange server. If Autodiscover is incorrectly provisioned, it can cause Outlook functionality to be dramatically impacted.

Solution

VSE 8.8 does not cause this issue. Microsoft has indicated that correcting the Autodiscover provisioning alleviates this problem.

McAfee can't provide advice about how to configure Exchange Autodiscover. You must contact Microsoft Technical Support for assistance to identify the cause of the excessive wait time consumed by Microsoft MSO.DLL. McAfee recommends that you obtain a Windows Performance Recorder Trace of the node to verify that the issue is related to wait time being consumed by Microsoft MSO.DLL. If it does not, contact McAfee Technical Support using the details provided in the Related Information section below.

To learn more about Autodiscover provisioning, see https://msdn.microsoft.com/en-us/library/office/jj900169%28v=exchg.150%29.aspx or contact Microsoft Support.

Related Information

Affected Products

Known Issue/Product Defect
VirusScan Enterprise 8.8

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Slow performance with Microsoft Outlook when Opening emails or switching between folders

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Slow performance with Microsoft Outlook when Opening emails or switching between folders

Environment

Problem

Cause

Solution

Related Information

Affected Products

Languages:

Glossary of Technical Terms

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