Ensure that the Reading Pane is turned on by following this Microsoft article for Outlook for PC and this Microsoft article for Outlook for Mac. If you are using Outlook for PC or Outlook for Mac, the add-in will be grayed out if the Reading Pane is turned off or hidden.
add the add-in in each inbox if you're using multiple inboxes.have the necessary permissions from your email administrators to use third party add-ins in your inbox.Check your Outlook version to ensure it is Click-to-run. Please note: Outlook installed from the Microsoft Store is not compatible with the HubSpot Sales Office 365 add-in. If you're having trouble installing the add-in, make sure you meet the following requirements: Please note: if you're using HubSpot Sales Outlook desktop add-in, check out this article instead. The information below helps with troubleshooting certain issues with the Office 365 add-in.
