This is a pretty common question I get from customers.  Here are some great R2 guides/documents in Word format or all the 38 R2 guides/documents listed below combined into ONE CHM format file (great for quick R2 reference searches).  Very useful for OCS administrators, etc.

 

Download either format here.

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Here is a list of R2 guides available:

 

OCS 2007 R2 Administering CWA

OCS 2007 R2 Administering Group Chat

OCS 2007 R2 Administering OCS

OCS 2007 R2 Backup and Restoration

OCS 2007 R2 Command Line Reference

OCS 2007 R2 Deploying Archiving Server

OCS 2007 R2 Deploying Certificates   (just released a couple days ago)

OCS 2007 R2 Deploying Communicator

OCS 2007 R2 Deploying CWA

OCS 2007 R2 Deploying Dial-In Conferencing

OCS 2007 R2 Deploying Edge Servers

OCS 2007 R2 Deploying Enterprise Edition

OCS 2007 R2 Deploying Enterprise Voice

OCS 2007 R2 Deploying Group Chat Server

OCS 2007 R2 Deploying in a Multiforest Topology

OCS 2007 R2 Deploying Monitoring Server

OCS 2007 R2 Deploying Response Group Service

OCS 2007 R2 Deploying Standard Edition

OCS 2007 R2 Getting Started - Documentation Roadmap

OCS 2007 R2 Getting Started - New Client Features

OCS 2007 R2 Getting Started - New Server Features

OCS 2007 R2 Getting Started - Technical Overview

OCS 2007 R2 Getting Started - Unified Communications Glossary

OCS 2007 R2 Migration from 2005

OCS 2007 R2 Migration from 2007

OCS 2007 R2 Planning

OCS 2007 R2 Preparing Active Directory Domain Services

OCS 2007 R2 Security

OCS 2007 R2 Supportability

OCS 2007 R2 Technical Reference for Clients

OCS 2007 R2 Technical Reference

OCS 2007 R2 Troubleshooting

OCS 2007 R2 Upgrading the Evaluation to Full Released Version

OCS 2007 R2 Walkthrough - Mediation Server Replacement

OCS 2007 R2 Walkthrough - Scale to Load Balanced Edge Server

OCS 2007 R2 Walkthrough - Scale to Load Balanced EE Pool

OCS 2007 R2 Walkthrough – Small- to-Medium Business Deployment

OCS 2007 R2 Walkthrough - Voice Deployment