Vista - How to retireve "PR_SEARCH_KEY" property of a mail in vbscript formailbox using Outlook MAPI?

Can someone guide me here:

I am writing a vbscript file to retrieve properties of mails in mailbox. I
want to know what key is used to get the PR_SEARCH_KEY property. I am new.
Can someone direct me to newsgroup/forum/documentation more specific to my
work? Any help would be highly apreciated.



REM
REM

Set objSession = CreateObject("Outlook.Application")

For i = objFolders.Count To 1 Step -1
Set objFolder = objFolders.Item
If Trim(UCase(objFolder.Name)) <> "PUBLIC FOLDERS" Then
set objRootFolder = objFolder
End if
Next

Set objFoldersColl = objRootFolder.Folders


for each oRoot in objFoldersColl
For each objMessage in oRoot.Items
writelog(objMessage.ENTRYID) REM for getting PR_ENTRYID property
of the mail
REM
REM What do I write here? objMessage.??
REM
Next
Next


REM
REM

Regards,
Lima