The new Outlook supports Exchange Online accounts for Office 365 commercial subscriptions as well as (formerly Hotmail) accounts paired with Office 365 Home and Personal subscriptions. The new version number, 15.3, syncs with the latest major version numbers for Outlook's Windows counterpart, which is currently at. The news came in a blog post from the Office 365 team, which promised that the new version would deliver 'improved performance and reliability and a fresh look and feel that is unmistakably Microsoft Office.'
The new version requires an Office 365 subscription to be activated. In a surprise announcement today, Microsoft released a new version of Outlook for the Mac.