I am using Outlook as the client for an IMAP set up web email account, but can only get Outlook to save sent mail if I tick the 'save to computer' box. If I try to specify save to the correct 'sent items' in the relevent email folder it can temporarily appear in the folder but disappears after a few minutes. Sometimes the sent item appears in the relevent 'inbox'. The problem with using the 'save to computer' option is that the host email account doesn't receive or save a copy of that mail and if I have a system failure then I'll have no record of those sent items. This is not peculiar to Outlook 2010- I also have a PC running 2007 and that has exactly the same problem.