Sarah, this might or might not help you; just in case: I had a similar issue with a Prezi email getting “lost” … for whatever reason, my Outlook has 2 easily viewed filtered folders (Junk AND Clutter, which seems like overkill, but I digress) but there is also a daily Quarantine that is NOT easily viewed until Outlook sends me the recap at midnight every 24 hrs. So, I kept trying & trying, checking all the filters etc. and finally the next day realized it had been quarantined. Outlook allows you to release the original email back to your Inbox, so that’s what I did and here I am telling you about it. I wonder if your school’s email has a similar feature? Just a thought. (It has been such a pain for me overall since it has also caused me trouble with time-sensitive reset emails for other things.) I do hope you can get this resolved quickly!!