In the old system, I was able to do the following:
1) Go to the 'sent items' folder
2) Click the top checkbox to select them all
3) Select 'Inbox' in the drop down menu
4) Click the 'move to' button
Why you might ask? Because, during the day, I use webmail at work. However, when at home I use Outlook. I therefore want emails I've sent during the day to be available in Outlook. When I download them this way, they the ones I've sent obviously appear in my 'inbox', however, it's easy to see the 'sender' email address, select the ones from me, and drag and drop them into my sent folder.
What's even more annoying is that this option has been removed from the old webmail which is still 'available'. Call me cynical but they've turned this optional beta testing into demand.