Mail client re-downloading mail

[Warrick FitzGerald]

Hi All, My server just crashed - when it came up one of my users keeps getting the same emails over and over again. Every time he hits send and receive in outlook, the same messages appear. It's almost when he deletes or mark a message as read the server is not aware of the change in state, so the next time he hits send\receive it grabs it again. Does anyone know how I can fix \ debug this. Thanks Warrick