In Infopath the Conditions in rules are limited to only 5 !!!

You can overcome this by changing your last condition to "The expression" and use "and" or "or" as needed to create your compound condition. So, for example, if you need to make sure both field1 and field2 are not blank, you'd use the expression:



If you need help figuring out the correct syntax for your expression, first set up the condition using the drop downs (for example, select field1 in your first drop down, then "is not blank" in your second drop down), then change the first drop down to "The expression" -- whatever your condition was will auto populate into the box for the expression. Paste that into a text editor, and then do the same for the rest of your conditions. Add and or or between them as needed, and you have your expression!