To unsuppress messages, right-click in the Messages window, and select Manage Suppression. In the Manage Suppression dialog box (shown in the previous figure), select the rule to remove, and click the remove button .
Note: Alternatively, you can click the Manage Message Suppression toolbar button to open the Manage Suppression dialog box.
Tip: To temporarily display suppressed messages, click the Filter Messages toolbar button , and select Show suppressed or Show both. The message icon has a backslash (\) to indicate that the message is suppressed but displayed.