The PPM menu is not visible and how to Re-enable the Plug-in for PPM
If PPM was unexpectedly halted during operation (for example, the system on which PPM is running fails), you may need to re-enable the Plug-in for PPM from Microsoft Project in order to display the PPM menu.
To re-enable the Plug-in for PPM from Microsoft Project:
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Click Help > About.
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Click Disabled Items.
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If the Plug-in for PPM is listed, remove it from the list to enable it.