Outllook Macro Runtime Error. Could not find object.

I have created a macro for a pop-up alert to indicate when a new mail message has arrived in a shared public folder inbox.  It works without an issue on one set (Outlook 2003 SP2).  On another, with the same Outlook configuration, I receive the doomed 'runtime error' indicating it can't find an object.  I debug and it

highlights Set flr = ns.Folders(szDir)

The code is thanks to this site and some of my tweaking for path.  Ultimately I want to tweak this to look at three public inboxes and alert our users that a new message has arrived.  Perhaps there is a more efficient way in the code to do this and any help offered would be great.

Obviously I need to fix the runtime error before I go any further.

Here's the code (again thanks to BluDevilFan):
Private WithEvents olkFolder As Outlook.Items
Private WithEvents olkFolderOrders As Outlook.Items

Private Sub Application_Quit()
    Set olkFolder = Nothing
    Set olkFolderOrders = Nothing
End Sub

Private Sub Application_Startup()
    Set olkFolder = OpenMAPIFolder("\Mailbox - Searches Mailbox\Inbox").Items
    Set olkFolderOrders = OpenMAPIFolder("\Mailbox - Orders - Two Rivers Title\Inbox").Items
End Sub

Private Sub olkFolder_ItemAdd(ByVal Item As Object)
    MsgBox "A new item has arrived in the SEARCHES Inbox."
End Sub

Private Sub olkFolderOrders_ItemAdd(ByVal Item As Object)
    MsgBox "A new item has arrived in the ORDERS Inbox."
End Sub

Function OpenMAPIFolder(szPath)
    Dim app, ns, flr, szDir, i
    Set flr = Nothing
    Set app = CreateObject("Outlook.Application")
    If Left(szPath, Len("\")) = "\" Then
        szPath = Mid(szPath, Len("\") + 1)
    Else
        Set flr = app.ActiveExplorer.CurrentFolder
    End If
    While szPath <> ""
        i = InStr(szPath, "\")
        If i Then
            szDir = Left(szPath, i - 1)
            szPath = Mid(szPath, i + Len("\"))
        Else
            szDir = szPath
            szPath = ""
        End If
        If IsNothing(flr) Then
            Set ns = app.GetNamespace("MAPI")
            Set flr = ns.Folders(szDir)
        Else
            Set flr = flr.Folders(szDir)
        End If
    Wend
    Set OpenMAPIFolder = flr
End Function

Function IsNothing(obj)
  If TypeName(obj) = "Nothing" Then
    IsNothing = True
  Else
    IsNothing = False
  End If
End Function

Can someone point me in the right direction? I've patched and updated the PC that gets the runtime error.  I've tried this searching only ONE inbox as well and the same issue.

Thanks!
pgrazideAsked:
Who is Participating?
 
David LeeCommented:
Greetings, pgrazide.

That error only occurs when the folder path is either incorrect (i.e. there is no such path) or inaccessible.  Have you verified that the shared mailbox is open in the Outlook profile of the user on the computer where this is failing?

Cheers!
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pgrazideAuthor Commented:
Sure enough, it was the path!  Weird that it is different from one machine to another.

Truly appreciate your help!
Paul
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David LeeCommented:
You're welcome, Paul.  Glad I could help.
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