This attribute specifies the logon name used to support clients and servers running LAN manager and older versions of the operating system, such as Microsoft Windows NT® 4.0 operating system, Microsoft Windows® 95 operating system, and Microsoft Windows® 98 operating system. This attribute must be less than 20 characters to support older clients.

cn: SAM-Account-Name
ldapDisplayName: sAMAccountName
attributeId: 1.2.840.113556.1.4.221
attributeSyntax: 2.5.5.12
omSyntax: 64
isSingleValued: TRUE
schemaIdGuid: 3e0abfd0-126a-11d0-a060-00aa006c33ed
systemOnly: FALSE
searchFlags: fPRESERVEONDELETE| fANR | fATTINDEX
rangeLower: 0
rangeUpper: 256
attributeSecurityGuid: 59ba2f42-79a2-11d0-9020-00c04fc2d3cf
isMemberOfPartialAttributeSet: TRUE
systemFlags: FLAG_SCHEMA_BASE_OBJECT | 
 FLAG_ATTR_REQ_PARTIAL_SET_MEMBER 
schemaFlagsEx: FLAG_ATTR_IS_CRITICAL

Version-Specific Behavior: Implemented on Microsoft Windows® 2000 Server operating system, Windows Server® 2003 operating system, Windows Server® 2003 R2 operating system, Windows Server® 2008 operating system, and Windows Server® 2008 R2 operating system.

The schemaFlagsEx attribute was added to this attribute definition in Windows Server 2008.