SEATTLE , Tue Jan 29, 2013  - Microsoft Corp launched new Office software for home users, featuring constantly updated, online access to documents from all kinds of devices as the world's largest software company attempts to tailor its most profitable product to a mobile generation.

The new Office suite of applications - including desktop staples Outlook email, Excel, Word and PowerPoint - is aimed at home users rather than businesses, and is designed to extend Microsoft's domination of the workplace to the home office and beat back growing competition from Google Inc's free online apps.

The version of the new software launched on Tuesday, called Office 365 Home Premium, is the first major overhaul of Office since 2010.

Tuesday was the first look for individual customers, and initial reactions were positive at Microsoft's flagship Seattle store.

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After downloading the basic programs online, users can access the latest versions of all Office applications from up to five devices on a subscription basis for $100 a year.

The software will be updated online, marking a change from the past where users had to wait years for upgrades to installed software.

It is the latest step in what Chief Executive Steve Ballmer called Microsoft's "transformation to a devices and services business," making the company more like Apple.

The new Office largely adopts the look of last year's Windows 8, with a cleaner, more modern-looking design and includes touch-screen capability.

The "ribbons" showing commands in Word and Excel are mostly unchanged. For the first time the package includes online calling and video service Skype, which Microsoft bought in 2011.

Users' work can be stored on their devices but also in remote data centers - known as the cloud - and the latest version of a document can accessed from any licensed device with a browser.

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Two and a half years in the making, the new Office is designed to extend Microsoft's domination of the business market and counter the growing popularity of Google Apps, a collection of online-only, Office-style applications Google provides free for home users and sells to businesses for $50 per user per year.

Microsoft is hoping its move into online services, alongside its new Surface tablets, will push it into the forefront of mobile computing, which has been led by Google's Android software and Apple's combination of slick hardware and apps.

"Microsoft Office remains the gold standard for productivity applications," said Avi Greengart, research director at Current Analysis. "It is bringing Office fully into today's connected, cloud-based environment. But it still has more work to do to make it fully finger-friendly for use on its own Windows tablets."

The new Office will run natively on Microsoft's own Surface tablets - both the 'RT' and Pro versions running on ARM Holdings and Intel Corp chips respectively - but it will not run natively on Apple's iPad, disappointing some iPad users who are also Office fans.

"We have not said that we will do rich client software on the iPad at this point," said DelBene, although he did not rule out producing such software in the future. "We've been very logical in our approach. I'm pleased with the software we have delivered for the iPad to date," he said.

Microsoft's SkyDrive online storage system and its OneNote note-taking software are available as iPad apps, and iPad users can use limited Web versions of some Office applications.

The iPad issue has been a long-time quandary for Microsoft, which might gain more mobile users by making Office available on the iPad but would have to give Apple a cut of its subscriptions. Availability of Office on iPads would also take away a major incentive to buying its own competing Surface tablet.