When I check my emails on my iPhone, I notice I am seeing emails that are not appearing in Outlook on my computer. This has only happened since I downloaded an Outlook upgrade. I'm afraid of missing important emails. Where are they going?
It could be that your iPhone is deleting the messages off the server before your Outlook client downloads them. Check for a setting related to this. It might be called something like "Leave a copy on the server" or "Delete messages from server after downloading."