UPDATE 2-Salesforce.com forecast disappoints, shares fall

* Q1 EPS 15 cents vs Street view 11 cents

* Company cuts full-year revenue forecast

* Sees Q2 rev $312 mln-313 mln vs Street view of $319 mln

* Shares fall 6 percent after-hours (Adds analyst comment, profit forecasts, byline)

By Jim Finkle

NEW YORK, May 21 (Reuters) - Salesforce.com Inc (CRM.N) warned on Thursday that current-quarter revenue from sales of its Web-based software would miss analysts' estimates and cut its full-year outlook, sending its shares down 6 percent.

Jefferies & Co analyst Ross MacMillan said he believes the company cut its forecast because it posted weaker-than-expected bookings of subscriptions to its software during its first-quarter quarter ended April 30.

"The worst isn't behind us," MacMillan said.

But the maker of Web-based computer programs for running sales activities reported a better-than-expected first-quarter net profit of $18.4 million, or 15 cents a share, compared with $9.6. million, or 6 cents, a year ago.