In an organization in which both Communicator 2005 and Communicator 2007 are deployed, many core features that Communicator 2005 users expect are still available, as shown below in Table 1.

Table 1.    Coexisting with Communicator 2005

Office Communicator 2007 and Office Communications Server 2007 Features

Available with Communicator 2005

Instant messaging and basic presence

P

Enhanced presence

 

Computer-to-computer voice calls

P

Access to external federated users

P

Public IM Connectivity

P

File transfer with Communicator 2007 clients

P

Rich text and Tablet PC Ink in instant messages

P

Computer-to-computer video calls with Communicator 2007 users

 

In-house audio and video conferencing

 

Web conferencing with external users

When used with Live Meeting 2007

Audio/video conferencing with external users

When used with Live Meeting 2007

Unified Communications Enterprise Voice features

 

However, features that are hosted on Office Communications Server 2007 are not supported by the Communicator 2005 client. For example, when a Communicator 2007 user invites a Communicator 2005 user to join an audio/video conference hosted on Office Communications Server 2007, a message appears saying that the other party is not able to accept that type of call (unless A/V encryption is disabled on the A/V Multipoint Control Unit (MCU)).

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