We have a 32-bit application that currently uses 32-bit MAPI integration with Outlook to retrieve contacts from Outlook for a specific user. Some of our customers are wanting to upgrade to 64-bit Outlook or Outlook 365, so we are looking for a solution that will work with each of these environments (32-bit Outlook, 64-bit Outlook, and Outlook 365) but would prefer to not have to maintain separate code bases for each environment. We are also not planning to upgrade our application to be 64-bit in the foreseeable future, so this most likely needs to be a 32-bit solution (if possible).