Sendent for Outlook offers two options for integrating secure file sharing into your email workflow: the VSTO add-in and the web add-in. While both achieve the same core function, there are key differences to consider when choosing between them.


VSTO Add-in

  • Compatibility: 
  • Works on Windows versions of Outlook 2016, 2019 and 2021 (only in “Classic Outlook” mode). 
  • Not compatible with newer versions for Windows or Outlook for Mac/Web.
  • Technology: Leverages COM/VSTO technology, which Microsoft is phasing out for newer Outlook for Windows versions.
  • Future-Proofing: 
  • Sendent will continue to support the VSTO add-in for as long as Microsoft supports Outlook 2016, 2019 and 2021. 
  • Sendent will assist users who wish to transition to the web add-in as they upgrade their Outlook versions.


Web Add-in

  • Compatibility:
  • Outlook on Windows: Microsoft 365 subscription or Outlook 2021 for Windows (with Version 1910 build 12130.20272 or later) or Outlook 2019 for Windows (with new UI enabled).
  • Outlook on Mac: Microsoft 365 subscription or Outlook 2021 for Mac (with Build 16.47 or later).
  • Outlook on Web: Modern Outlook UI (See the Microsoft support article Use add-ins in Outlook)
  • Technology: Built on Microsoft's modern web framework, ensuring better performance, reliability and cross platform availability.
  • Features: Streamlined interface, consistent experience across platforms, and focus on core functionalities like secure file sharing and upload links. Advanced theming options are not currently available in the web add-in.
  • Future-Proofing: The recommended option for new users and those planning to upgrade Outlook.


Choosing the Right Sendent for You

  • If you use an older version of Outlook for Windows and value advanced customization, the VSTO add-in remains a viable option with our continued support.
  • For everyone else, the web add-in is the future-proof choice, offering wider compatibility, a modern interface, and a focus on all core functionalities.


Sendent Subscription Options

  • Sendent for Outlook offers Standard and Plus plans that include access to both the VSTO and web add-in. This provides flexibility for users with different Outlook versions and ensures a smooth transition for existing users as they upgrade to newer Outlooks that may not support the VSTO add-in.
  • For the latest information, please refer to the Sendent for Outlook website.