IMAP Users: Email addresses using IMAP through Outlook will not be able to use the add-in. Mobile: Outlook on iOS and Android for Office 365 mailboxes rolling out gradually to users.Desktop: Outlook 2013/2016 for Windows, Outlook 2016 for Mac (in Insiders) with, Office 365 or Exchange 2013/2016 mailboxes.Web: all users with, Office 365 or Exchange 2013/2016 mailboxes.With the Trello add-in for Outlook you can create cards with descriptions and due dates, without ever leaving Outlook.