>1) I can get my 'Inbox' email with my 'ShowInboxMail' function below, how can I access the email in 'Outbox' & 'SenItems'?

With Simple MAPI ActiveX wrappers you will not be able to have access to folders. From VFP you can try to use Collaboration Data Objects (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdo/html/_olemsg_programming_tasks.asp),
But better make your own wrapper of extended MAPI in VC++, because CDO is not redistributable without Exchange Server or MS Outlook (so even that Microsoft says that MAPI is client independent, if you wish to use some of the high-level wrappers of it you will fall in client dependency)
Also see: MSKB #Q200018 (http://support.microsoft.com/default.aspx?scid=kb;EN-US;q200018)


>2) My Window 98SE PC install with 'Outlook Express' & 'Outlook 2000', and the 'Outlook Express' is set as the default e-mail program. My 'ShowInboxMail' function will display the 'Outlook Express' Inbox email for the first run only, when I run it again, it will switch to 'Outlook 2000' Inbox email, why? (I notice the oSession.sessionid also change automatically.)
Have no idea. Have not seen this behaviour. Will check it ASAP, but I promise nothing.

{snip}

HTH