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This article describes an update that is available for Microsoft Lync 2010 Group Chat clients. This update disables the ability to add all members of a category to a chat room as members. The following functionalities are updated:

  • When a user creates a chat room in a Group Chat client, the Same as category category name option is disabled in the Initial Membership List page of the Create a Chat Room wizard.

  • Assume that a user right-clicks the chat room, and then clicks Manage…. If the Create a new membership list option that is located under the Settings tab is selected, it cannot be deselected.


Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

322756 How to back up and restore the registry in Windows
To resolve this issue, install the following cumulative update:

2636065 Description of the cumulative update for Lync 2010 Group Chat client: November 2011

After the update is applied, to have us enable the policy for you, go to the "Fix it for me" section. If you prefer to enable the policy yourself, go to the "Let me fix it myself" section.

Fix it for me

To enable the policy automatically, click the Fix it button or link. Then click Run in the File Download dialog box, and follow the steps in the Fix it wizard.


  • Install the cumulative update that is described in Microsoft Knowledge Base (KB) article 2636065 before you run this Fix it solution.

  • This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.

  • If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD and then run it on the computer that has the problem.

Then, go to the "Did this fix the problem?" section.

Let me fix it myself

After the update is applied, follow these steps to enable the policy:

  1. Click Start, click Run, type regedit, and then press ENTER.

  2. Locate and then click the following registry subkey:

  3. Right-click DisableCategoryBasedMembershipPrototyping, and then click Modify.

  4. In the Value data box, type 1, and then click OK.

  5. Exit Registry Editor.

Did this fix the problem?

  • Check whether the problem is fixed. If the problem is fixed, you are finished with this section. If the problem is not fixed, you can contact support.

  • We would appreciate your feedback. To provide feedback or to report any issues with this solution, please leave a comment on the "Fix it for me" blog or send us an email.

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