m Milli. Prefix for 10 to the power of -3 (0.001).
M Mega. Prefix indicating 10 to the power of 3 (1000).
Ma Milliampere
MAPI Message Application Programming Interface (Microsoft).
MARS Multicast Address Resolution Server
MB Megabyte
Mbps Megabytes per second. Transfer rate, commonly used to measure network traffic and internal disk transfer speeds.
Mb Megabit
Mbps Megabits Per Second. Transfer rate, commonly used to measure file transfer rates across the Internet or other networks.
MBR Master Boot Record
MCA Micro Channel Architecture. A proprietary design standard developed by IBM.
MCI Microwave Communications, Inc. (company).
MCP Microsoft Certified Professional
MCPS Microsoft Certified Product Specialist
MCSD Microsoft Certified Solution Developer
MDT Mountain Daylight Time. Time zone, GMT -7:00
MDY or MMDDYY Month Day Year. Standard date format for Western (North America) countries.
MFM Modified Frequency Modulation. MFM was a early drive interface for PC's.
MHz Megahertz. The prefix "mega-" equals one million; therefore, megahertz = 1 million hertz. This is a measure of operating frequency of RAM and memory.
MIPS Millions of Instructions Per Second. This is a measure of processing speed, usually referring to CPU's.
MIDI Musical Instrument Digital Interface. MIDI allows for the connection of electronic musical instruments to a PC via a sound card and cable.
MIME Multipurpose Internet Mail Extension. Emails are encoded to ensure privacy and encryption using MIME. The information is scrambled, sent, then descrambled.
MIS Management Information Systems
MMX MultiMedia eXtensions. An instruction set developed by Intel (etal.) To enhance the multimedia performance of CPU's / PC's.
MODEM Modulator / Demodulator. Modems allow PC's to receive and transmit information via a telephone network connection (including the Internet). There are many different kinds of modems, the most common being a 56K (v.90 current standard).
MP3 MPeg layer 3. A sound encoding format allowing for individual segments of music (songs or sound bytes) to be stored, transferred and played via a PC. Portable MP3 Players are also available, including the Diamond RIO.
MPEG Motion Pictures Expert Group. A file format for movies.
MPPC Microsoft Point-to-Point Compression
ms Millisecond. Time measurement unit, commonly used to measure storage device (hard disk, CD-ROM) data access speed.
MSAV Microsoft Anti-Virus
MSCDEX Microsoft CD-ROM EXtensions.
MSCE Microsoft Certified Engineer.
MSIE Microsoft Internet Explorer. Internet browser, developed by Microsoft in the early 1990's to compete with Netscape's Navigator product. MSIE is now the most used browser (on the x86 PC platform) in the world.
MSD Microsoft System Diagnostics. A utility program integrated into DOS and early Windows versions to enable the user to obtain information about the PC. Newer Windows versions have replaced this with the SYSINFO program.
MSRP Manufacturer's Suggested Retail Price
MTBF Mean Time Before Failure. PC components have a limited life span. MTBF is measures in hours of normal use before the device will "wear out", or fail.
MSN The Microsoft Network. MSN is a nationwide ISP, run by Microsoft.
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