Runtime Error 91 object variable not found

Within the last 6 months we've upgraded from exchange 5.5 and access 97 to exchange 2003 and access 2003.

In our exchange environment, we have public folder that people post employee file notes to - incident reports, good job, etc - via an outlook form that we designed some time ago.

In the access database that keeps all of this information there is an import function.  A employee in hr would click import and it would write all of this information to the access database, each record being a separate email in the public folder where it pulls from.

Now, since the upgrade, I keep getting the error:  runtime error 91 object variable or with block variable not set.

When you click debug, it brings you to the vb code behind this database, which is posted below.
The debugger is pointing to the following line as being the problem:
If objItems(i).UserProperties("Exported") = 0 Then

The whole code is below.

Option Compare Database
Option Explicit

Sub ImportFileNotesFromOutlook()
   
    ' Set up DAO objects (uses existing "FileNotes" table
    Dim rst As DAO.Recordset
    Set rst = CurrentDb.OpenRecordset("FileNotes")
   
    ' Set up Outlook objects
    Dim ol As New Outlook.Application
    Dim olns As Outlook.NameSpace
    Dim cf As Outlook.MAPIFolder
    Dim c As Outlook.MailItem
    Dim objItems As Outlook.Items
    Dim Prop As Outlook.UserProperty
    Dim iNum As Integer
    Dim i As Integer
   
    Set olns = ol.GetNamespace("MAPI")
    Set cf = olns.Folders("Public Folders").Folders("All Public Folders").Folders("Employee File Notes")
    Set objItems = cf.Items
    iNum = objItems.Count
    If iNum > 0 Then
        For i = 1 To iNum
            If objItems(i).UserProperties("Exported") = 0 Then
                Set c = objItems(i)
                rst.AddNew
                rst!EENumber = c.UserProperties("Employee Number")
                rst!EmployeeName = c.UserProperties("Employee Name")
                rst!Department = c.UserProperties("EmployeeDepartment")
                rst!WrittenBy = c.UserProperties("Written By")
                rst!EmployeeNumber = c.UserProperties("Employee Number of Writer")
                rst!DateAndTimeOfEvent = c.UserProperties("Event Date and Time")
                rst!AreaObserved = c.UserProperties("Area Observed")
                rst!Description = c.UserProperties("Description of Event")
                rst!CorrectiveActionTaken = c.UserProperties("Corrective Action Taken")
                rst!FollowUpRequired = c.UserProperties("Follow up required")
                rst!FollowUpTime = c.UserProperties("Follow-up Time")
                rst.Update
                c.UserProperties("Exported") = -1
                c.Save
            End If
        Next i
        rst.Close
        MsgBox "Finished."
    Else
        MsgBox "No File Notes to export."
    End If
   
End Sub

Private Sub cmdimport_Click()
'On Error GoTo Err_cmdImport_Click
'
    ImportFileNotesFromOutlook
'
'Exit_cmdImport_Click:
'    Exit Sub
'
'Err_cmdImport_Click:
'    MsgBox Err.Description
'    Resume Exit_cmdImport_Click
'
End Sub

Please help.  This looks just fine to me.....and it worked for years before the upgrade.

Thanks!