"I will try 'Download complete items including attachments for
subscribed folders."

I've tried this as well. No joy. I've also tried removing and re-
adding the account. I've been through and checked all the settings.
I see nothing different.

It's quite odd actually. I sat at this user's computer and sent her
test messages from a web browser. I'm sitting there with the Inbox
selected... Outlook makes its usual new message tone and the new
message counter increases, but nothing shows in the Inbox. If I click
another folder, then click back to the Inbox, there they are.