- Right-click the organizational unit (OU) for which you want to block IM, and choose Properties.
- Click the GPO you want to apply.
- Click Edit.
- In Group Policy Editor (GPE), expand User Configuration, Administrative Templates, System.
- In the right pane, double-click the Don't run specified Windows applications option.
- Click Enabled, then click Show.
- Click Add and type the name of restricted IM program (e.g., msnmsgr.exe, trillian.exe, etc.)
- Click OK three times.
- Close GPE.
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