Office Communications Server 2007 R2 Group Chat

Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.

The following table contains the minimum hardware and software requirements for the Office Communications Server 2007 R2 Group Chat client.

Table 1. Hardware and Software Requirements for the Group Chat Client

System component Minimum requirement

Operating system

Windows 7.

Windows Vista with Service Pack 1 (SP1).

Windows XP Professional with SP3.

Windows Server 2003 Professional with SP3.


1-gigahertz (GHz) or higher processor, Intel Pentium-compatible.


1 gigabyte (GB) of RAM.

Disk space for installation

30.3 megabytes (MB).

Display resolution

Required: Super VGA 800 x 600.

Recommended: Super VGA 1024 x 768 or higher.

Bandwidth requirements

Minimum of 56 kilobits per second (Kbps).


Administrator permissions, or, in Vista Standard User Mode, administrator credentials, to install Group Chat.

Other software components

Microsoft .NET Framework 3.5 SP1.

The Microsoft Visual C++ development system Runtime 2 (versions 2.0.50727.761 and earlier are not supported).


If Microsoft Visual C++ Runtime 2 is not present on the computer, the Group Chat installation program installs it during installation. If Microsoft .NET Framework 3.5 SP1 is not on the computer, the user is prompted to download and install it before proceeding.

Other requirements

  • Actual requirements and product functionality can vary according to the system configuration and the type of operating system.


When installing the Group Chat client, you may encounter an "Invalid Win32 application" error. To resolve this issue, log off and log back on.