Ø When trying to install OCS 2007 R2 on a Windows 2008 R2, bellow error will come on screen.
Ø This is due to a condition which is set on "OCSCORE.MSI". Edit the "OCSCORE.MSI" use a MSI Editor and remove the condition. I am using “OCRA", which can be easily downloaded freely.

Ø Delete the Value Launch Conditional Value.

Also note to enable “Desktop experience” on the server.
Dial In Conference.
Dial-in conferencing allows users to join an audio conference either via PSTN or VoIP.
Scheduling via Outlook and reservation less conferencing options
Multiple language support by Conferencing Attendant
Users are authenticated against Active Directory for better security
Group Chat
List of available Chat Rooms
Chat Room History
Customizable filters and alerts
Archiving for compliance
Desktop Sharing
One-click sharing from Office Communicator and Communicator Web Access
Communicator Web Access for a cross platform experience
Call Me functionality
Fast rendering
Web Access
Consistent experience, no training
Ability to invite anonymous users
Cross-platform support, zero client
Multi-party instant messaging
Web based desktop sharing
Add audio to an existing session by Office Communications Server dial out to a preferred device
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Response Group
IVR , Speech Recognition and
Text-to-Speech Call Treatment
User-configured routing rules
Serial, parallel, longest Idle
& round robin routing
Call Queuing with Music on Hold
Agent presence aggregation
Call context on inbound calls
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HD Video
Support for VGA* and HD** for peer-to-peer video on capable PCs
Interop with select Polycom and Tandberg videoconferencing endpoints
Resolution setting can be configured by either IT or users
**. MS patner Portal.
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