Description of the Office Web Apps update: April 12, 2011

Microsoft has released an update for Microsoft Office Web Apps. This update provides the latest fixes for Office Web Apps. Additionally, this update contains stability and performance improvements.

This article describes a critical update that removes a file dependency in Microsoft Office Web Apps 2010 that is running in a mixed mode server environment.

This update enables you to run Office Web Apps 2010 Service Pack 1 (SP1) in an RTM version of Microsoft SharePoint Server. The update also enables  you to run the RTM version of Web Companions 2010 in SharePoint Server 2010 Service Pack 1 (SP1).

If you do not install this critical update, mixed mode server environments and later hotfixes may not work correctly.

Installation details

Update details

This update does not replace any previously released update.

How to obtain and install the update

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

Download the update package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=F81266F2-5E1A-4627-A9DE-6A6BC57EB07A)

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.

Restart information

You do not have to restart the computer after you install this update.

File information

This update contains files that have the versions that are listed in the following table.


The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office. For more information about the Office System TechCenter, visit the following Microsoft website: