Week numbers in the Outlook Web App and Outlook calendars are mismatched in an Exchange Server 2010 environment

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Article ID: 2784083 - View products that this article applies to.
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Symptoms

In a Microsoft Exchange Server 2010 environment, the week numbers that are displayed in the Outlook Web App calendar do not match the week numbers that are displayed in the Microsoft Outlook calendar. For example, in the English version of Outlook Web App, the first week in 2013 is numbered "2." However, in the English version of Microsoft Outlook 2010, the first week in 2013 is numbered "1."

Notes
  • To display the week number in Outlook Web App, select the Show week numbers in Month View check box in the Calendar settings.
  • To display the week number in Outlook 2010, select the Show week numbers in the month view and in the Date Navigator check box. This check box is located under the Display options heading in the Calendar tab of the Outlook Options dialog box.

Cause

This issue occurs because Outlook Web App uses a different mechanism to calculate week numbers.

Resolution

To resolve this issue, install the following update rollup:
2746164 Description of Update Rollup 6 for Exchange Server 2010 Service Pack 2
Note After you apply this update rollup, you can run the Get-MailboxCalendarConfiguration cmdlet together with the FirstWeekOfYear parameter to display the first week of the year. Additionally, you can run the Set-MailboxCalendarConfiguration cmdlet together with the FirstWeekOfYear parameter to set the first week of the year based on one of the following values:
  • FirstDay
  • FirstFourDayWeek
  • FirstFullWeek

Status

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

More information

For more information about a similar issue that occurs in an Exchange Server 2007 environment, click the following article number to view the articles in the Microsoft Knowledge Base:
2289607 Week numbers do not match between OWA and Outlook calendars in the English and French versions in an Exchange Server 2007 environment
For more information about the Get-MailboxCalendarConfiguration cmdlet, go to the following Microsoft website:
General information about the Get-MailboxCalendarConfiguration cmdlet
For more information about the Set-MailboxCalendarConfiguration cmdlet, go to the following Microsoft website:
General information about the Set-MailboxCalendarConfiguration cmdlet
For more information about the CalendarWeekRule enumeration, go to the following Microsoft website:
General information about the CalendarWeekRule enumeration

Properties

Article ID: 2784083 - Last Review: February 12, 2013 - 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: 
kbsurveynew kbqfe kbexpertiseinter kbfix KB2784083

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