We run an Exchange 2007 platform with Outlook 2003 clients. All users are setup in cached mode. However on occasion we have to move them to online mode. Also, when users access their emails remotely via Citrix, the Outlook session they connect to will be in online mode, so they do differ between the two.
We have found that sometimes when switching between modes, that users Outlook client will resend a bunch of completely random old emails (anything from 2 to10 mails we have experienced so far).
Would anyone be able to suggest why its doing this, and how I can prevent this from happening?