PostItem Object (Outlook)
Represents a post in a public folder that others may browse.
Unlike a MailItem object, a PostItem object is not sent to a recipient. You use the Post method, which is analogous to the Send method for the MailItem object, to save the PostItem to the target public folder instead of mailing it.
Use Items(index), where index is the index number of a post or a value used to match the default property of a post, to return a single PostItem object from a public folder.