People in my organization often don't pay attention to the size of the email attachments. My habit is to save the emails to the PST files. Hence the problem: my PCT files are huge. The solution: remove attachments. Simple Marco does the trick:
Sub RemoveAttachments()
Dim oMailItem As MailItem
Dim objAttachments As Outlook.Attachments
Dim i As Integer
Set oMailItem = Application.ActiveExplorer.Selection.Item(1)
Set objAttachments = oMailItem.Attachments
If objAttachments.Count > 0 Then
For i = objAttachments.Count To 1 Step -1
objAttachments.Item(i).Delete
Next i
oMailItem.Close (olSave)
End If
Set oMailItem = Nothing
End Sub