I feel a little embarressed at having to ask this, but I'm short on time and an obvious solution evades me:
I have a user who swaps between using 2 desktop machines. Desktop 1 has Outlook 2010 installed on it, and Desktop 2 has Outlook 2003 installed (for legacy plug-in support). Both machines connect to our Exchange 2003 server.
Up until now, she has been able to use both machines seemlessly, but recently Desktop 2 had to be rebuilt. On configuring Outlook 2003 for her, it began to download all of her mails and strip them from the Exchange server. We could actively see them being downloaded to Outlook 2003 and removed from Outlook 2010's inbox, so I quickly switched Outlook 2003 to Offline mode to prevent further loss.
Both machines have Cached Exchange mode disabled (the same as before the rebuild), but regardless of whether I enable or disable it, the same issue occurs.
I've been through all the menus I can find and can't find an option related to this issue. It's as if I'm connecting via POP3 with 'Leave a copy on the server' disabled.
Anyone have any ideas? Thanks!