I have seen this posted a couple times without a real resolution other than some work around suggestions. I have an advanced alert configured to fire when 'LastBoot' has changed and status not equal to Unmanaged. If I unmanage a Windows 2003/2008 node then reboot or recycle SNMP the alert is suppressed until the unmanaged window expires. Once the window expires we then get the reboot notices. We are running NPM 10.0 and 10.0 SP1 (two seperate instances - same behavior). I have tried the schedule unmanage utility with the same outcome. Has anyone else seen this? Anyone have any suggestions?