Concert -  End User System Requirements

Supported Operating Systems
Windows XP SP3
Windows Vista (32-bit/64-bit)
Windows 7 (32-bit/64-bit)
Windows 2008 Server (64-bit)
Mac OS X 10.6 Snow Leopard
Mac OS X 10.7 Lion
Mac OS X 10.8 Mountain Lion
Hardware Requirements
Intel Core2 Duo CPU 2.XX GHz or AMD processor (2 GB of RAM recommended)
Supported Browsers
Internet Explorer: 8 - 10 (32-bit/64-bit)
Mozilla Firefox: 10 – 27
Google Chrome: 23 – 32
Apple Safari: versions supported by the supported operating systems (Mac OS X 10.6, 10.7, 10.8)
Meeting Client and Browser Requirements
Chrome 32 and later and Firefox 27 and later do not support Java. You will be prompted to install the appropriate Cisco WebEx plug-in the first time you attempt to start or join a meeting, or playback a meeting recording from either of these browsers.
If you are using a browser other than the specified versions of Chrome or Firefox and have Java enabled, the Cisco WebEx Meetings Application will automatically download onto your system the first time you start or join a meeting. We recommend that you install the latest update for your Java version.
JavaScript and cookies enabled
Active X enabled and unblocked for Microsoft Internet Explorer (recommended)
Java 6 and Java 7 (for web browsers that support Java) ( - Verify Java Version)
Cisco WebEx plug-ins enabled (for Chrome 32 and later and Firefox 27 and later)