In late January 2013, Microsoft launched its consumer-focused version of Office 2013, known as Office 365 Home Premium. On February 27, the company launched the updated business versions of its Microsoft-hosted Office 365 offerings.
Microsoft has added three new packages to its Office 365 line-up for businesses: Office 365 ProPlus, Office 365 Midsize and Office 365 Small Business Premium. These complement the existing Office 365 Small Business and Enterprise offerings, which Microsoft is updating with many of the latest new features and functions that it introduced late last year for the on-premises complements of the products in the suite. (Microsoft released to manufacturing Exchange Server 2013, SharePoint Server 2013 and Lync Server 2013 in October 2012.)
What does "launch" actually mean in the context of Office 365? Here's what Microsoft officials told me:
Read more at source:
Microsoft launches updated Office 365 for business users | ZDNet