The meaning of the Acronym IM is...

IM is

• Item Manager
• Insensitive Munitions
• Information Management
• Independent Mode
• Integrally Mounted
• Item Maintenance
• Insensitive Munition

More Meanings For IM:

• Information Model
• Intermediate
• Bitmap graphics (Sun raster file)
• Internet Machine
• Instant Messaging
• IntelliMouse
• Instant Messenger
• Internet Messaging
• Instant Messanger
• Instant Message
• In The Module
• Instant Messaging
• Instant Message
• Intellectually Mild
• Interrupt Me

IM is also in:

• Chat
• Databases
• Drivers
• File Extensions
• General
• Hardware
• Networking
• SMS
• Software