By default, OfficeTalk does not allow other workgroups to connect to your workgroup in any way. Permission to do this must be explicitly set by a supervisor. For more information, see "Granting Access to Remote Workgroups" below.
OfficeTalk gives you full control over what data you give to remote workgroups. At a higher level, you can decide whether or not to give specific remote workgroups access to your diary, project, planner, contact information etc.
Additionally, you can specify the access rights of a remote workgroup to individual items of data in just the same way that you administer your local security. For example you may wish to give members of the remote workgroup access to the diaries of certain individuals in your workgroup, but not others.
To provide even more control over security, OfficeTalk lets you grant individual access to specific users in a remote workgroup. This could be useful, for example, if you wished to grant to the members of a particular remote workgroup, read only access to the local user's diaries but wished to grant full access to one specific member of the remote workgroup.
More:
Granting Access to Remote Workgroups