Ver v1.0.20 R2, for java

The 2007 R2 version of Microsoft? Office Communicator Mobile for Java is an enterprise application for mobile devices optimized for Java-enabled cell phones that helps you quickly find and communicate with your colleagues. The application is designed to make communication easier and more accessible and includes real-time presence information, single number reach support and rich instant messaging (IM) capability all with a familiar look and feel similar to the desktop version of Microsoft Office Communicator. Officially supported only on the following networks: AT T(USA); O2,Orange, Vodafone(Europe); Airtel,Vodafone(India), but might work on other networks also. Landscape mode is not supported on the N95 E66.
Key features of the R2 version:
1. Single Number Reach support – With Single Number Reach, your desk phone and mobile phone will ring when an incoming call arrives

2. Enhanced presence information – For users running multiple Communicator applications (Office Communicator, Office Communicator Mobile, Office Communicator Phone Edition), Office Communications Server 2007 R2 will determine the best option to reach you by showing the most active application you are running for your presence information.
3. Usability updates – You have access to recent contacts, expanding distribution lists on your Windows Mobile device, and easy navigation between multiple IM conversations.
4. Communicator Mobile for Java Enabled Devices – Communicator mobile is available for Nokia S60v3, S60v5 and S40 devices as well as Motorola RAZR devices. The application provides presence information, IM capability and the ability to search your company directory.
If the below generic version doesnt work on your phone, please go the the link below and download your phone specific version.