An error occurs when a user whose mailbox is hidden from the Exchange address list tries to open the Scheduling Assistant tab by using the light version of Outlook Web App

Article ID: 2705570 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • A mailbox user is hidden from the global address list in a Microsoft Exchange Server 2010 environment.
  • The user accesses the mailbox by using the light version of Outlook Web App.
  • The user creates an appointment or a meeting request and then clicks the Scheduling Assistant tab.
In this scenario, the user receives the following error message:
An unexpected error occurred and your request couldn’t be handled.

Request
Url: URL
User host address: Host Address
User: User
EX Address: legacyExchangeDN
SMTP Address: SMTP Address
OWA version: OWA version
Mailbox server: Mailbox server

Exception
Exception type: Microsoft.Exchange.InfoWorker.Common.Availability.MissingArgumentException
Exception message: Element Number of MailboxArray is null.

Call stack
Microsoft.Exchange.InfoWorker.Common.Availability.AvailabilityQuery.ValidateSpecificInputData()
Microsoft.Exchange.InfoWorker.Common.Availability.Query'1.ValidateInputData()
Microsoft.Exchange.InfoWorker.Common.Availability.Query'1.Execute()
Microsoft.Exchange.Clients.Owa.Core.Utilities.ExecuteAvailabilityQuery(OwaContext owaContext, AvailabilityQuery query. Boolean expectFreeBusyResults, Boolean expectMergedFreeBusyResults, AvailabilityQueryResult& result)
Microsoft.Exchange.Clients.Owa.Core.Utilities.ExecuteAvailabilityQuery(OwaContext owaContext, AvailabilityQuery query. AvailabilityQueryResult& result)
Microsoft.Exchange.Clients.Owa.Basic.CalendarItemSchedulingTab.GetFreeBusyData()
Microsoft.Exchange.Clients.Owa.Basic.CalendarItemSchedulingTab.OnLoad(EventArgs e)
System.Web.UIControl.LoadRecursive()System.Web.UIPage.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

CAUSE

This issue occurs because the light version of Outlook Web App uses a Lightweight Directory Access Protocol (LDAP) query that references the showInAddressbook attribute to retrieve the user’s information from the global catalog server. However, the user does not have the showInAddressbook attribute. Therefore, a MissingArgumentException exception is thrown.


RESOLUTION

To resolve this issue, install the update rollup that is described in the following article in the Microsoft Knowledge Base: 
2685289 Description of Update Rollup 3 for Exchange Server 2010 Service Pack 2

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Properties

Article ID: 2705570 - Last Review: May 29, 2012 - Revision: 1.0
APPLIES TO
  • Microsoft Exchange Server 2010 Service Pack 2, when used with:
    • Microsoft Exchange Server 2010 Enterprise
    • Microsoft Exchange Server 2010 Standard
Keywords: 
kbqfe kbfix kbsurveynew kbexpertiseinter KB2705570

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