Exchange Calendar items are shifted incorrectly when some Windows DST updates are applied

Symptoms

After the latest daylight saving time (DST) update (3039024) is installed in a Microsoft Exchange Server 2013 or Microsoft Exchange Server 2010 environment, the calendar items may be shifted by one hour in the Calendar view.

Cause

This issue occurs because some time zone properties are truncated when they are passed from Windows to Exchange. However, Exchange cannot parse the truncated properties into a valid time zone. Therefore, Exchange uses the old time zone for the Calendar view.

Resolution

To fix this issue, install one of the following updates on your corresponding server that is running Exchanger Server, as appropriate:

• Update Rollup 12 for Exchange Server 2010 Service Pack 3

• Cumulative Update 11 for Exchange Server 2013

• A later cumulative update for Exchange Server 2013 (if available)

Note For existing calendar appointments that are incorrect, the calendaring tool must be run to correct these appointments.

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 the Microsoft Office Outlook tool, go to the following websites:

Using the Exchange Calendar Update Tool to address daylight saving time changes for Exchange Server (930879)

How rebase appointments using Microsoft Office Outlook Tool: Time Zone Data Update Tool for Microsoft Office Outlook