Hi All, Can any one comment on the following results of single instance ratio gathered by Perfmon.exe I am unable to understand these values. Can anyone tell that how do I read this single instance ration value. (PDH-CSV 4.0) (India Standard Time)(-330) \\ACA35\MSExchangeIS Mailbox(_Total)\Single Instance Ratio 04:58.0 1.356299405 05:13.0 1.356299405 05:28.0 1.356299405 05:43.0 1.356299405 05:58.0 1.356299405 06:13.0 1.356299405 Regards Kanwaljeet