Word, Excel, Powerpoint and Outlook have been redesigned to work better with touch-screen-controlled computers. They also integrate the firm's Skype video chat facility. Users can add further functions via a new app store.
The programs account for a major part of Microsoft's earnings. The firm hopes to keep users loyal by offering more powerful features than cheaper online alternatives.
In the last year the firm's Business Division, which creates the software, generated just under $24bn (£15.2bn), roughly a third of the firm's revenue.
However, a 4% dip in the US company's most recent quarterly profits was linked to the fact that many consumers had held off buying the older version of the software ahead of the revamp.
If it proves a success it might also drive sales of new Windows 8 or Windows RT-powered computers, which can take advantage of the applications' improved touch controls. Studies suggest users are switching to the systems at a slower rate than they adopted Windows 7 and Windows Vista.
Microsoft confounded rumours by not releasing a version of the Office software for Apple's iPad tablets. It has also decided not to offer the products on Android devices.
Source: BBC News
