To create a new item in a non-default folder programmatically, use the Add method on the target folder's Items collection:

   Set newItem = targetFolder.Items.Add("IPM.Post.YourFormName")

The message class parameter is optional.

To create an item in another person's mailbox, use Namespace.GetSharedDefaultFolder to get the target MAPIFolder. Otherwise, you can use the code at http://www.outlookcode.com/d/code/getfolder.htm to walk the folder hierarchy and return the MAPIFolder corresponding to a given path string.

FYI, there is a newsgroup specifically for general Outlook programming issues "down the hall" at microsoft.public.outlook.program_vba or, via web interface, at http://www.microsoft.com/office/community/en-us/default.mspx?dg=microsoft.public
.outlook.program_vba