Estimation Inc. will host its 10th annual User Conference April 18-20 in Orlando, Fla., at Walt Disney World's Yacht and Beach Club Resort. More than 150 contractors who use the Bidmaster NET computerized estimating and Purchase Master NET materials management systems will convene to participate in three days of informational seminars, roundtable discussions, hands-on demonstrations, and one-on-one sessions. During the conference, Estimation will release enhanced versions of Bidmaster and Purchase Master.