[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-18

The main task of planning for instant messaging (IM) and presence is ensuring that you have enough Front End Servers for your users. In a Front End Server pool, you should have one Front End Server for every 12,500 users homed in the pool.

Enabling Communication with External Users

You can greatly increase the benefits of your investment in Microsoft Communications Server 2010 conferencing by enabling your users to communicate with external users. External users can include:

  • Your organization’s own users, when they are working outside your firewalls and are using their laptops or other Communications Server devices.

  • Users from companies you work with who also run Communications Server; to enable your users to easily contact these users, you create federated relationships with these companies.

  • Users of Public IM services, such as IM services provided by the MSN network of Internet services, Yahoo!, and AOL. (Public IM connectivity required a separate license.)

To enable any or all of these scenarios, you deploy an Edge Server to enable secure communications between your Communications Server deployment and external users. Your organization’s remote users, as well as users at federated organizations, will be able to see each other’s presence and communicate using secure IM. For more information about enabling communication with external users, see External User Access.

Archiving IM Content

Communications Server provides features you can use if your organization must follow compliance regulations. You can use the Archiving Server to archive the content of IM messages for all users in your organization, or only certain users. For details, see Archiving Server.