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You cannot install Unified Communications Managed API Redistributable and receive an unclear error message

Article ID: 981253 - View products that this article applies to.

SYMPTOMS

You have a computer that has the Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package version 9.0.30729 installed. If you try to install Microsoft Unified Communications Managed API Redistributable (UCMARedist.msi), the installation process fails. Additionally, you receive the following error message:

Microsoft Unified Communications Managed API 2.0 Core Redist installation or uninstallation requires that VC++ 2008 Redistributable is already installed.

This error message is not clear because it does not indicate that a specific version of Visual C++ 2008 Redistributable package is required.

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RESOLUTION

To resolve the problem of failing to install the Microsoft Unified Communications Managed API Redistributable, download and install the Microsoft Visual C++ 2008 Redistributable Package version 9.0.21022 from the following Microsoft Web site:

Download Microsoft Visual C++ 2008 Redistributable Package version 9.0.21022

(http://www.microsoft.com/downloads/details.aspx?familyid=9B2DA534-3E03-4391-8A4D-074B9F2BC1BF&displaylang=en)

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STATUS

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

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MORE INFORMATION

For more information about the Microsoft Unified Communications Managed API Redistributable (UCMARedist.msi), visit the following Microsoft Knowledge Base article:

976657

(http://support.microsoft.com/kb/976657/ )

Description of the cumulative update for Office Communications Server 2007 R2, Unified Communications Managed API 2.0 Core Redist 64-bit: April 2010

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