Very easily done in InDesign. See:
window >> interactive >> hyperlinks
window interactive >> buttons
Your final product needs to be a .pdf, and don't forget to check Inlcude hyperlinks when exporting to .pdf.
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You cannot bind action to the list of options in a drop down list in InDesign. Actions can be applied to the Form field events like 'on click', 'on blur', etc.
I made you a quick sample which just opens up an email client, populates email address based on choise that user has made in combobox and some custom subject and body meassage text. You can find it from my dropbox: https://dl.dropbox.com/u/17227987/sampleform.pdf
-combobox´s properties > Validate tab and