Microsoft released Outlook for Mac 15, departing from its history of bundling the application with its Office for Mac suite. Also new was that the release was targeted exclusively at Office 365 customers and not made available as a standalone product. It required activation via online subscription and offered no method for entering a serial number for perpetual use of the product.
The application was referenced in Office Blogs simply as “Outlook for Mac”. It was not referenced as Outlook 2015, avoiding any hint about the name of the next version of Office for Mac—presumably “Office for Mac 2015″. The only versioning Microsoft has provided is “15.3″ as shown in Outlook’s About Outlook menu.
While the application includes some major under the hood changes, the interface is practically the same as its Outlook 2011 predecessor. It boasts little new functionality. New functionality that was added was almost exclusively for Office 365 customers. Some long-standing features were actually removed too.