Quarterdeck Office Systems was a computer software company that was founded by Therese Myers and Gary Pope in 1981 and incorporated in 1982.
The company’s most famous products are Quarterdeck Expanded Memory Manager, DESQview/X, Quarterdeck Mosaic, CleanSweep, Manifest, and Partition-It.
In 1989 the company was awarded a US software patent that allowed multiple windowed PC applications under MS-DOS.
Quarterdeck grew rapidly in the 1990’s by acquiring several companies. This rapid growth, along with the collapse of the market for MS-DOS based utilities, ultimately led to the company’s failure.
In 1998 Quarterdeck was acquired by Symantec (the Norton Utilities company). Symantec discontinued Quarterdeck products or integrated them into larger offerings.