This is MSU’s primary email service and one that has been used by the MSU community for the past ten years (https://mail.msu.edu/webmail). An MSU NetID is required for accessing this service. Visit https://netid.msu.edu/activate if you have not yet activated your MSU NetID.
New undergraduate students are being migrated to Office 365 starting June 8, 2015. Until students are migrated, they will continue to use this system. To determine which system you are on, please visit https://mail.msu.edu. After signing in to that page, undergraduate students who have been migrated will be directed to the Office 365 portal. All others will be directed to this page.
Read more at https://tech.msu.edu/office365/.