Microsoft released a public preview of Office 2016 for Mac . This preview (aka beta) of Office 2016 for Mac includes updated versions of Word, Excel, PowerPoint, OneNote and Outlook is open to the public, works only on Yosemite, and times out in 60 days.
Updates will be automatically installed as they are released. (A public preview for Office 2016 for Windows will be available in the coming weeks.)
Outlook 15 for Mac
An Outlook update is also available for Office 365 subscribers. This update provides new functionality and various improvements and fixes for Outlook for Mac for Office 365. Like the Office preview, it requires Yosemite.
In addition to fixing some bugs, crashes, and overall performance, this update introduces side-by-side calendars, allowing you to view up to three calendars side by side in Outlook for Mac.