I am using Outlook 2007 and experiencing something strange.

Because I have a couple of email addresses I have my account set to 'Arrange by e-mail Account' and mail sent from a particular address, (eg me@there.com) appears in my Sent Items Folder, but in 1 of 2 locations,
both locations show E-mail Account: me@there.com (X items) but one seems to contain original messages that I have created while the other seems to contain any message that I have replied or forwarded.
This makes it impossible to easily trace any series of mail exchanges because you have to keep swapping between these 2 locations to try and follow any particular series of emails.
There also seems to be no way of combining these locations, or moving messages from one to the other?

I am at a complete loss to understand what is going on and if anyone can offer some helpful suggestions it would be greatly appreciated please.
Thanks, Graham