In a demonstration at the press conference, it became clear that Microsoft has tried to give the Office applications a more modern, clean interface.

Microsoft held off on providing full details on all the different Office bundles and prices, but it did disclose details on three cloud models that each will include Word, Excel, PowerPoint, OneNote, Outlook, Publisher and Access.

The first version, called Office 365 Home Premium, will be aimed at individual consumers and families and include 20GB of storage in the company's Skydrive cloud storage service, as well as 60 minutes of Skype world minutes per month.

The second version, Office 365 Small Business Premium, is, as its name indicates, for small businesses, and includes business-grade email and calendaring and high-definition Web conferencing.

This version is "ideal" for businesses with up to 10 employees, and each user can access it on as many as five different PCs or Macs, according to a fact sheet.