York University IT (UIT) has a mandate to retire old domains and move all email accounts to Microsoft Office 365 server.

For users who would requested their mail to be migrated to o365 
here is  a link that will walk you through the PPY yorku mail 
migration to o365

Mail Migration to o365

Tips and tricks for using Outlook Web Access:

Migration Information: Email Migration - yuoffice (yorku.ca)

Microsoft Outlook Guides: Outlook training (microsoft.com)

LinkedIn Learning – Outlook Essentials Training

Here are some user guides: yuoffice (yorku.ca)