Microsoft Corp has announced a milestone for the next version of Windows and several new deals designed to boost its online-search business. The company showed a preliminary version of Windows 7, the next major edition of its operating system, available for consumers to test on their personal computers starting Friday. Microsoft also announced a five-year deal with Verizon Wireless to make its Internet-search service broadly available on the wireless carrier's mobile phones and a similar agreement with Dell Inc covering that hardware maker's PCs.