PM sent = Private Message sent to the person who'd opened the thread (OP). Usually sent in response to the original post in accordance with OP's wishes.
Prime Minister
Project Management
Performance Monitoring
Personal Message
Project Manager
Paul Mccartney
Private Messaging
Poor Man
Pay Me
Program Manager
Priority Mail
Precious Metal
Post-Mortem
Post Mortem
Particulate Matter
Plus or Minus
Power Mac
Power Management
Pain Management
Planning Meeting
Precious Moments
Pardon My ....
Preventive Maintenance