When you install the Communications Server Web Components during setup of a Standard Edition server or an Enterprise pool, by default, group expansion is enabled for the Enterprise pool or Standard Edition server on which you install it. You can do the following to manage group expansion:

To configure group expansion

  1. Log on to the Web Conferencing Server using an account in the RTCUniversalServerAdmins group.

  2. Open the Office Communications Server 2007 R2 snap-in.

  3. In the console tree, expand the forest node, and then do one of the following:

    • For an Enterprise pool, expand Enterprise pools, right-click the pool, click Properties, and then click Web Component Properties.

    • For a Standard Edition server, expand Standard Edition servers, right-click the pool, click Properties, and then click Web Component Properties.

  4. Click the Address Booktab.

  5. On the Address Booktab, do the following:

    • To enable group expansion, select the Enable distribution groups expansioncheck box. If you enable group expansion, you can change the maximum number of users to which any instant message can be sent by typing the maximum group size you want to allow in Maximum group size.

    • To disable group expansion, clear the Enable distribution groups expansioncheck box.