MS11-028: Description of the security update for the .NET Framework 3.5 Service Pack 1 and the .NET Framework 2.0 Service Pack 2 on Windows Vista Service Pack 2 and Windows Server 2008 Service Pack 2: April 12, 2011

Microsoft has released security bulletin MS11-028. To view the complete security bulletin, visit one of the following Microsoft websites:

• Home users:
  http://www.microsoft.com/security/pc-security/bulletins/201104.aspx
  Skip the details: Download the updates for your home computer or laptop from the Microsoft Update website now:
  http://update.microsoft.com/microsoftupdate/
• IT professionals:
  http://www.microsoft.com/technet/security/bulletin/ms11-028.mspx

How to obtain help and support for this security update

For home users, no-charge support is available by calling 1-866-PCSAFETY in the United States and Canada or by contacting your local Microsoft subsidiary. For more information about how to contact your local Microsoft subsidiary for support issues with security updates, visit the Microsoft International Support website: North American customers can also obtain instant access to unlimited no-charge email support or to unlimited individual chat support by visiting the following Microsoft website: For enterprise customers, support for security updates is available through your usual support contacts.

Download information

The following file is available for download from the Microsoft Download Center:

Download the package now.

Release Date: April 12, 2011

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Known issues and additional information about this security update

After you install security update 2449742 on a Windows Server 2008-based system that is running certain versions of Exchange Server or SQL Server, you may experience any of the following issues:

• On a SQL server, you cannot launch Powershell or Event Viewer, and the SQL Reporting Service will not start.
• On an Exchange server, you cannot start launch Powershell or Event Viewer.
• The Exchange Mailbox Replication Service terminates unexpectedly.

For more information about�this problem, please click the following article number to view the article in the Microsoft Knowledge Base:�


For more information about installation issues with the Microsoft .NET Framework 3.5.1, click the following article number to view the article in the Microsoft Knowledge Base:

Command-line switches for this update

For more information about the various command-line switches that are supported by this update, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

This update does not require a system restart after you apply it unless the files that are being updated are locked or in use.

Update removal information

To remove this update, use the Add or Remove Programs item in Control Panel.

Update replacement information

This security update replaces the following updates:

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

For all supported x86-based versions of systems

GDR Service Branch

LDR Service Branch

For all supported x64-based versions of systems

GDR Service Branch

LDR Service Branch

For all supported IA-64-based versions of systems

GDR Service Branch

LDR Service Branch