I found it! It wasn't easy. You have to create a rule to detect them and do
whatever you want with them -- the trick is the detection.
1. Do Tools / Rules Wizard, click New Rule, choose "Start from a blank
rule", leave the selection on "Check messages when they arrive", and click
Next.
2. Toward the bottom of the Step-1 conditions, check "with selected
properties of documents or forms", then click the blue hyperlink "selected
properties" in Step 2 below.
3. Drop down the Field button, and choose Forms.
4. Drop down the top-left list, which says "InBox" and choose instead
"Application Forms".
5. In the newly populated list on the left, double-click Accept, Decline,
and Tentative to add them to the list on the right.
6. Click OK until you're back to the Rules Wizard -- I think you can take it
from here.
