Search notes:

Outlook Object Model: Attachment

Methods and properties

application
blockLevel
class
delete()
displayName Seems to correspond to the attachment's file name (but the documentation explicitly states that it does not need to be the actual file name).
fileName
getTemporaryFilePath() Only valid for those attachments whose type property is olAttachmentType.olByValue, i.e. the attachment is a copy and that the copy can be accessed even if the original file is removed.
index
parent
pathName
position
propertyAccessor
saveAsFile()
session
size
type

Index