Thursby Software has released DAVE 3.1, a new version of its Mac-to-PC file and printer sharing software. DAVE 3.1 is offered as a free electronic upgrade for customers who purchased DAVE during this calendar year and upgrade by December 31, 2001, and for those who have a support contract. Others may purchase the upgrade for US$89.95; the full retail price of DAVE 3.1 is $149.