Well, when I first started investigating this I thought I was a Pre question. But it may be more of an Outlook/Exchange question.

I noticed that my Outlook inbox had only about 20 items, but my Pre's inbox shows 123 items.

After some digging, I disabled Cached Mode in Outlook and restarted Outlook. Lo and behold, my server inbox had 123 items.

So my question: is there any way to force Outlook to update the server from the cache? (Since I don't know the differences, I would prefer to keep the cached version and update the server rather than the other way around.)