Are you using hotmail synced to OE?
If so try logging on tto the mail through IE and checking any email you deleted in OE has also gone. If not delete it.
If this doesn't work close OE and delete the hotmail-inbox.dbx folder and restart OE
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.