SAN JOSE, Calif. - Two years after announcing a somewhat vague software-distribution partnership, Google Inc. and Sun Microsystems Inc. have clarified their tactics for jointly attacking Microsoft Corp. and its ubiquitous Office software.

Over the weekend, Google quietly began including Sun’s StarOffice suite of word processing, spreadsheets and other workplace-oriented programs for free as part of the Google Pack download.

The download package is part of Google’s efforts to expand beyond Web search and control more of users’ computing experience online and offline. It already includes Firefox, the No. 2 Web browser behind Microsoft’s Internet Explorer, and RealNetworks’s RealPlayer, a key rival to Microsoft’s own media player.

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