The reason for using formfield checkboxes is that those are supported on all Word versions, both PC and Mac, whereas content controls are not. The only Word version that doesn't support macros is Mac Word 2008, which is little used these days.

The coding for formfield checkboxes is quite different and, without knowing how you envisage the conditions statement changing according to which options are chosen, it's impossible to do any meaningful coding. Even the code I provided for content controls would have to be completely re-written to accommodate multiple selections (if you try the original solution, you'll see only one selection can be made).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]