Article ID: 972097
A distribution group expansion fails in Microsoft Office Communicator 2007 R2, and then you receive the following error message:
Cannot save a local copy of your distribution groups. If this problem continues, contact your system administrator.
This issue occurs if the local part of a distribution group’s e-mail address contains a "/" character (for example, firstname.lastname@example.org).
To work around this issue, click OK. Then, the distribution group expands successfully.
To resolve this issue, apply the following update:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.