After the mailboxes have been moved to the new the platform, changes need to be made to the existing Mac Mail account for it to connect to the new servers.
If at any point in time you are having any difficulty, please do not hesitate to call our support team.
Toll Free: 888.608.MAIL (6245)
- Go to Tools > Accounts...
- Choose an Exchange account.
- Select Advanced...
- Change the Server: field to, https://outlook.office365.com