What does XMS stand for?

Expanded Memory Status (UWER)

Experimental Development Specification - Military (CAAL)

Experimental Missile Specifications

Extended Memory Specification - Computer science

eXtended Multiprocessor operating System (SAUS)

Moroccan Sign Language - Language code (ETLW)

Xavier Mission Sisters - Catholic Mission Sisters of St. Francis Xavier - Roman Catholic religious order

X-Band Microwave Source

Xerox Memory System