Given that SquirrelMail has not been updated in the last ten years, users should urgently migrate to Office 365 to take advantage of its features and services. Those who have been using the email exchange tool will need to upgrade to a service that is more suitable for their communication needs, and Office 365 is an ideal choice.

Find more information at: https://www.office365tips.org/migrate-squirrelmail-to-office-365/