Want to get creator, lastmodifier, and other security info for an item in an event sink?

You can extract a considerable amount of security information using the http://schemas.microsoft.com/exchange/security/ namespace. The information returned is in XML, so individual elements need to be extracted from the XML.  The following
vb function  is an example that shows how to get security information.

' This function extracts security information for an item using an
' DispInfo.EventRecord.  This can be used in an Event Sink from a method
' such as IExStoreSyncEvents_OnSyncSave.
' Input:
'   ado_rec - This is a DispInfo.EventRecord (ado.record). The pEventInfo
'      parameter from OnSyncSave, etc can be used.
'   sSearchSIDType - Type of SID information - "creator", "lastmodifier", etc.
'      Note: See http://schemas.microsoft.com/exchange/security/ Namespace
'   sSearchValue - The specific value to return - "S:display_name", etc
' Returns:
'   If sSearchValue is not set to "" then
'      The security information for the item is returned.
'   else
'      An XML String containing the SID information is returned.
' Note: if you run the code and check the value of sReturn, you will see an
'   XML document that contains all of the returned items you can extract using
'   the sSearchValue argument.
' Example call:
'   sCreator = GetItemSecurityInfo(ado_rec, "creator", "display_name")
' Note: You will need to set a project reference to Microsoft XML, v4.0
' Note: You can download MSXML 4.0 SP2 fro the following link:
'    MSXML 4.0 Service Pack 2 (Microsoft XML Core Services)
'    <http://www.microsoft.com/downloads/details.aspx?FamilyID=3144b72b-b4f2-46da-b4b6-c5d7485f2b42&displaylang=en>
' Note: for more info, go to:
'    schemas.microsoft.com/exchange/security/ Namespace
'    http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wss/wss/_exch2k_schema_security_namespace.asp
Private Function GetItemSecurityInfo(ado_rec As ADODB.Record, sSearchSIDType As String, sSearchValue) As String
        Dim oDoc As New MSXML2.DOMDocument40
        Set oDoc = New MSXML2.DOMDocument40
        Dim oNodeList As IXMLDOMNodeList
        Dim oNode As IXMLDOMNode
        Dim sSearchValueW As String
        Dim sReturn As String     ' Return value
        Dim sXML As String        ' Holds the SID information in XML
        sXML = ado_rec.Fields("http://schemas.microsoft.com/exchange/security/" & sSearchSIDType)
        oDoc.loadXML sXML       'Load the XML text conaining all the SID information
        'oDoc.Save "c:\test.xml"    ' Uncomment to save to file
        If sSearchValue <> "" Then
            sSearchValueW = "S:" & sSearchValue ' See the text returned into sXML for what S: refers to
            Set oNodeList = oDoc.getElementsByTagName(sSearchValueW)  ' Get to the value we are looking for
            Set oNode = oNodeList.nextNode
            sReturn = oNode.Text  ' OK, here it is
            sReturn = sXML
        End If
        GetItemSecurityInfo = sReturn
End Function