In my innocence/ignorance I had not heard of any software uptime counters. I didn't realize that you were writing with one in mind. I simply recorded when Tiger and Panther were installed in the relevant 'boxes', since which time the iMacs have neither fallen over nor been switched off.

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(60x) 13DT + 3PB + PTPro; (G3) 7DT/MT; (G4) 3T + PB. System 8.1 to OS 10.5.8