I have run the PTA on a couple of my Exchange 2003 SP2 Servers from my workstation running XP SP2. PTA application version 1.1.7812.3 PTA configuration version 1.3.4.0 However, when I try to view the reports I get "Failed to retrieve performance counter data from the file". "An unspecified error occuyrred while reading the file." Anyone seen this error and have a solution? Many thanks -- Dave Parker CICT CCLRC Rutherford Appleton Laboratory UK