NEW YORK — Can New York’s Sullivan & Cromwell dig itself out of a very deep hole? We’ll soon find out.

The final presentation of evidence in the Microsoft Corp. antitrust trial is set to begin today, with each side presenting three witnesses in the rebuttal phase of the case. When Microsoft put on its main defense, its 12 witnesses fared so poorly under cross-examination by David Boies, lead lawyer for the Justice Department, that competitors began pressing for aggressive remedies — namely, the breakup of Microsoft.