!! Customers using Office 365 (O365) should NOT use this VSTO Add-in, but should use the O365 Pronestor Office Add-in.
Users can download the installation file to install Planner's Outlook add-in:
Location: "My Settings" in Planner
Administrator's Action: Enable the installation files:
Go to "Settings"
Click "Other settings"
Scroll down to "Outlook installers"
Creating Installers for Different Outlook Versions
Here you can create the installer that matches your users. There is a difference between a 64-bit installer and a 32-bit installer:
The "Outlook Add-In 2016/Office365 for Pronestor" installer is a 32-bit
All installers without 64-bit in the name are also 32-bit
You might need to enable multiple installers if your users use different versions of Outlook.