Vigilance in keeping numbers of folders down. With 'modern' search
techniques great trees of folders categorising content are really not needed.
If someone's 'archive' folder structure could be flattened, this will help
Interrogate users as to their other 'devices'. Are they connecting many times,
possibly from many places? It is quite normal for people to forget a few 'places'.
Check whether the same mailbox is mapped into Outlook multiple times.
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