) was an antivirus
program introduced by Microsoft
for its MS-DOS operating system
. The program first appeared in MS-DOS version 6.0 and last appeared in version 6.22. The first version of the antivirus program was quite rudimentary, had no update facility (though a single update became available), and could only scan for about 1,000 viruses. Microsoft Anti-Virus for Windows
), included as part of the package, could be run under Windows 3.x
Microsoft Anti-Virus was supplied by Central Point Software
Inc. (later acquired by Symantec
and integrated into Symantec's Norton AntiVirus
product) and was essentially a stripped down version of the Central Point Anti-Virus
(CPAV) product which, in turn, Central Point Software Inc., had licensed from Carmel Software Engineering
in Haifa, Israel. Carmel Software sold the product as Turbo Anti-Virus
both domestically and abroad.
Microsoft Anti-Virus for Windows was also provided by Central Point Software. This product became noted as determining that the upgrade program of Windows 95 was detected as a computer virus, something which was embarrassing to Microsoft.
Both the MS-DOS and Windows versions of the latest product had common features; the "Detect and Clean" strategy of Microsoft Anti-Virus could scan for and detect 1,234 distinct viruses. Other features included the detection of boot sector
and trojan horse
-type viruses which was the typical virus problem at the time.
The program also had an anti-stealth and checksum feature that could be used to detect any changes in normal files. This technology was intended to make up for the unavailability of regular update packages. Only one virus update was introduced since the original releases bringing the total protection to 2,371 viruses in 1996.
Windows XP and Vista
With the acquisition of GIANT Company Software
and the release of Windows Defender
(formerly Microsoft AntiSpyware), and the acquisition of RAV Antivirus
from GeCAD Software
, Microsoft has once again entered the antivirus market with: