• M&A Mergers & Acquisitions
• MAC Media Access Control / Medium Access Control
• MADN Multiple Appearance Directory Number
• MAN Metropolitan Area Network
• MAP Manufacturing Automation Protocol
• MAPI Microsoft Mail Application Programming Interface
• MARC MAchine Readable Cataloging
• MAU Multistation Access Units
• MB MegaByte
• MBASIC Microsoft BASIC
• Mbps Mega bits per second
• MCA Micro Channel Architecture
• MCGA Monochrome Graphics Adapter
• MCI Media Command Interface / Media Control Interface
• MCS Microsoft Consulting Services
• MD Make Directory
• MDA Monochrome Display Adapter
• MDI Multiple Document Interface
• MEPS Multi-language Electronic Phototypesetting System
• MFC Microsoft Foundation Classes
• MFF MIDI File Format
• MFM Modified Frequency Modulation
• MHS Message Handling Service
• MHz MegaHerz
• MIB Management Information Base
• MIDI Musical Instrument Digital Interface
• MILNET MILitary NETwork
• MIME Multipurpose Internet Mail Extensions
• MIPS Million Instructions Per Second
• MIS Management Information Systems
• MLID Multiple Link Interface Driver
• MMAC Multi Media Access Center
• MMM Multiple Master Metrics
• MMU Memory Management Unit
• MNP Microcom Networking Protocol
• MO Magnetic Orientation / Magneto-Optical
• MODEM MOdulation DEModulation
• MOM Message-Oriented Middleware
• MOMspider Multi-Owner Maintenance spider
• MOO MUD Oriented Objects
• MOP Maintenance Operations Protocol
• MOS Mass Optical Storage / Metal Oxide Semiconductor
• MOST Mass Optical Storage Technologies
• MP/M MultiProgram monitor for Microcomputers
• MPC Multimedia PC
• MPEG Motion Picture Experts Group
• MPP Massively Parallel Processing
• MPU MicroProcessor Unit
• MR Modem Ready
• MRBC Multiple-Resolution Bitmap Compiler
• ms millisecond
• MS-BASIC MicroSoft BASIC
• MS-DOS MicroSoft DOS
• MSAU MultiStation Access Unit
• MSB Most Significant Byte
• MSDN MicroSoft Developer Network
• MSI Medium Scale Integration
• MSN MicroSoft Network
• MSP Master Stack Pointer
• MSRP Manufacturer's Suggested Retail Price
• MTA Message Transfer Agent
• MTBF Mean Time Between Failures
• MTF Modular Transfer Function
• MTTR Mean Time To Repair
• MTU Maximum Transmission Unit
• MUD Multi-User Dungeon / Multi-User Dimension / Multi-User Dialogue / Multi-User Domain
• MULTICS MULTI-User Interactive Computer System / MULTIplexed Information and Computing Service
• MUNG Mung Until No Good
• MUSE Multi-User Simulation Environment
• MUSH Multi-User Shared Hallucination
• MUSIC MUlti Session In Community
• MUX MUltipleX, MUltipleXor
• MVC Model-View-Controller
• MVDMS Multiple Virtual DOS Machines
• MVL Multi-Valued Logic
• MVP Multimedia Video Processor
• MVS Multiple Virtual Storage
• MX Mail EXchange Record