Display mail problem

Hello,

I need your help please, I’m running a Domino server version 6.5, we have 400 users(iNotes, Lotus Notes client and iphone).

This morning all email users are expensed as unread on all platforms (iNotes, iPhone and lotus client) and also in the domino server.

anubody have an idea please . thank you for your help and sorru for my bad english