Member names are not displayed in a distribution list in Outlook 2010

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Symptoms

When you expand a distribution list in Microsoft Outlook 2010, the names of the members of the distribution list are not displayed in the Members box.

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Cause

This issue occurs if the distribution list contains more than 5,000 members. The maximum number of members that a distribution list can contain in Outlook 2010 is 5,000.

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Resolution

To resolve this issue, apply the following update:

2598318 Description of the Outlook 2010 hotfix package (Outlook-x-none.msp): April 24, 2012

Note For this fix to work, the Exchange administrator must adjust a server-side time-out policy. The server-side throttling policy causes a random failure because the expansion takes too much time to access Active Directory Domain Services (AD DS). To avoid this failure, the administrator must increase the RCAPercentTimeInAD parameter to a larger value by using the Set-ThrottlingPolicy cmdlet.

For more information about this cmdlet, go to the following Microsoft website:

Set-ThrottlingPolicy

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