Example code for accessing a "shared mailbox subfolder"...

use strict;
use warnings;
use Win32::OLE::Const 'Microsoft Outlook';
use Win32::OLE 'in';
#Code for Outlook 97
my $FolderName = "my shared folder";  
my $strValidUser = "~ DSM Requests" ;  #mailbox name/alias
my $Outlook = Win32::OLE->GetActiveObject("Outlook.Application");
 
unless(defined($Outlook)){   
    die("Unable to obtain Outlook OLE handle $!\n"); 
}
my $objNS      = $Outlook->GetNamespace("MAPI");   
my $objRecipient = $objNS->CreateRecipient($strValidUser);
   $objRecipient->Resolve();    #You should check this!
       
my $objInbox  = $objNS->GetSharedDefaultFolder($objRecipient, olFolder
+Inbox);   
my $objFolder = $objInbox->Folders($FolderName);
foreach my $email (in $objFolder->Items ){       
   if ($email->{UnRead} == 0) {
        #blah blah
   }
}
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HTH - Mark