My Outlook 2011 on my Mac for some reason stopped putting copies of my sent emails into my Sent Items, but if I look in my inbox i see the sent email in the conversation thread.  I've already rebuilt the database, any other ideas?  Anyone ever seen this before?

Looking in webmail, the emails do not show in Sent Items either.

I tried looking in Tools > Accounts > Advanced button > Folders tab > Sent drop-down, but Folders is not the middle tab like i saw in some articles online.