• Build powerful apps for hundreds of millions of users using one set of APIs

    Build powerful Outlook apps using one set of APIs

    Reach hundreds of millions of users across web, Windows, Mac, and mobile.

  • Screen showing Outlook payments

    Build a payment experience in Outlook using Microsoft Pay

    Integrate a streamlined payment experience that reaches Outlook 365 and Outlook.com users right in their inbox.

  • Bring your Office 365 solution to market

    Bring your Office 365 solution to market

    Use the GTM Guide for ISVs to help maximize your reach and engage more users.