Decompile obtain source code for existing exe.

I have an older program that functions with Outlook. I have the excutable for it, but no source code. It may need the neccessary tools to obtain the source code again. then have it compiled into a more recent exe. I may need minor changes in the software. ## Deliverables I can be contacted at this phone number.? 425.495.2253. I can go over this simple task with you over the phone. Thanks John