| Class | Description | 
|---|---|
| MAPIAttribute | A pure-MAPI attribute which applies to a  HMEFMessageor one of itsAttachments. | 
| MAPIDateAttribute | A pure-MAPI attribute holding a Date, which applies 
 to a  HMEFMessageor one of itsAttachments. | 
| MAPIRtfAttribute | A pure-MAPI attribute holding RTF (compressed or not), which applies
  to a  HMEFMessageor one of itsAttachments. | 
| MAPIStringAttribute | A pure-MAPI attribute holding a String, which applies 
  to a  HMEFMessageor one of itsAttachments. | 
| TNEFAttribute | An attribute which applies to a  HMEFMessageor one of itsAttachments. | 
| TNEFDateAttribute | A Date attribute which applies to a  HMEFMessageor one of itsAttachments. | 
| TNEFMAPIAttribute | A TNEF Attribute holding MAPI Attributes, which applies to a 
   HMEFMessageor one of itsAttachments. | 
| TNEFProperty | Holds the list of TNEF Attributes, and allows lookup
  by friendly name, ID and MAPI Property Name. | 
| TNEFStringAttribute | A String attribute which applies to a  HMEFMessageor one of itsAttachments. | 
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