В данный момент я не могу проверить, но вы должны начать:
Dim oApp As Outlook.Application
Dim oNS As NameSpace
Dim oSent As Outlook.MAPIFolder
Dim strMessage As String
Dim strAddresses As String
Dim i, j
Set oApp = CreateObject("Outlook.Application")
Set oNS = oApp.GetNamespace("MAPI")
Set oSent = oNS.GetDefaultFolder(olFolderSentMail)
For i = 1 To oSent.Count
For j = 1 To oSent(i).Recipients.Count
''http://msdn.microsoft.com/en-us/library/bb176763(v=office.12).aspx
strAddresses = strAddresses & ";" _
& oSent(i).Recipients(j).Address
Next
strMessage = strMessage _
& Mid(strAddresses, 2) _
& oSent(i).Subject _
& oSent(i).SentOn & vbCrLf
Next