Microsoft Corp. is experimenting with selling its Office suite of programs to consumers on a subscription basis.

Instead of installing each program separately, a limited number of “beta” testers can download a bundle of Microsoft Word, Excel and other Office programs, the Windows Live OneCare antivirus program, Windows Live Mail and other free Windows Live programs.

The Redmond, Wash.-based software maker said the software subscription bundle will be more widely available later this year, but did not say how much it will cost.

But instead of paying up front - about $150 for Office Home and Student 2007 - subscribers will pay in regular installments for as long as they wish to use the programs. Even if PC users stop paying, their documents would still work with other programs or on other computers.