[This is preliminary documentation and subject to change.]
| Common-Name=Extension-Data | Admin-Display-Name=Extension-Data |
| Admin-Description=Extension-Data | Object-Class=Attribute-Schema |
| Attribute-ID=1.2.840.113556.1.2.228 | OM-Syntax=4 |
| Attribute-Syntax=String(Octet) | LDAP-Display-Name=extensionData |
| Multi-valued | System-Only=FALSE |
| Mapi-ID=\x80A8 | |
| Range 1 to 32768 | |
| Schema-ID-GUID={bf967971-0de6-11d0-a285-00aa003049e2} | Comment=used by Exchange |