Will there be an upgrade to MyMailList and AddressBook for Windows 10 in the near future? I have one that works with Windows 7 but also have a PC with Windows 10 that I would like to use with that program.
It's uncertain to say yes or no since only the developers can give you this answers. I've checked the official website, and it appears that you can install it only on the following versions of Windows: Windows XP, Windows 7 64-bit, Windows 7 32-bit, Windows 8 32-bit, Windows 8 64-bit.
I do believe that it will work on Windows 10 if you apply a compatibility tweak on both the installer and the main executable.