Struggling Sun Microsystems will try to show next month that it still has a lot of friends in the financial community. On Sept. 21, the Mountain View, Calif.-based company will hold a press conference in New York to show how various financial firms have begun to conduct trials with Solaris 10, the next version of its flagship operating system, and to install Sun's Opteron -based servers. Wall Street's endorsement is crucial for Sun. Financial losses, layoffs and declining market share have characterized the company over the past few years. The financial community was one of Sun's three chief markets. "They've slipped considerably in financial services. Linux has made big inroads there," said Gordon Haff, an analyst at Illuminata. The comeback is already under way, asserted John Fowler, executive vice president of the network systems group at Sun.