Thanks very much, Ion, You gave me a great answer... quick and operationnal ! Your two URLs http://www.nsisoftware.com/ http://wm.quest.com/products/availabilitysuiteexchange/ give us very good solutions to face a Exchange server crash. I add a complementary hint, in case it can be useful for other newbies as I am (!) I discovered (shame not to have done it before) that two functionalities can probably act as alternative personal backup/restore solutions. Would you agree with these statements ? -1-) PST files as personal email archives and backup: OUTLOOK .PST files can achieve a kind of 'individual personal backup' in case of a crash. They also are a good 'personal archive' for old emails. -2-) OST files : if configured in 'autonomous mode', my OUTLOOK client acts as a local replica of my personal mailbox. Does that mean that, in case of a EXCHANGE server crash (and rebuild of a new EXCHANGE server with same config), I would be able to 're-synchronize' my personal mailbox (OST file) with the new server ? In which case, I would be able to restore completely the content of my email. OK? (For 'public folders', no problem because we can achieve a good replication on other servers localized on the same site). OK ? my personal mailbox .