Older versions of Outlook for Windows (2007, 2010, or 2013) will not work with the Office 365 service.

However, you can use Outlook Web Access (mail.utoronto.ca) through a web browser to connect to your Microsoft 365 account.

Please note: Microsoft is retiring the Outlook Web Access feature that enables you to connect personal emails like Gmail/Outlook.com/IMAP into OWA. For multi-account workflows, please use the Outlook application for Windows/Mac. 

For a list of supported email clients, check out this article: Email clients that support modern authentication.