Microsoft plans on Thursday to start public testing for the first browser-based version of Office, although the technology preview is at least as notable for what it doesn't include as what it does offer.

The limited test of the so-called Office Web Apps includes versions of Word, Excel and PowerPoint, but not the OneNote note-taking application. And while Excel and PowerPoint offer the ability to edit and create documents, the current Web-based version of Word can only be used to view documents, essentially the same capability it already offers as part of its current Office Live Workspace product.

Microsoft said the Web versions of OneNote and Word share "the same editing surface," and that the technology that is still being worked on.

"We made the hard decision to turn off editing in the Word Web App at Tech Preview, in order for people to have the best experience at this early stage," Microsoft said.

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