Emails from Inbox getting moved to Trash and not by me?

Over the past 2-3 days, I have noticed that some of my emails that were in my inbox have been moved to my trash. I will go and delete a few from either my inbox or other folders, and then go to my trash to delete (I like to delete everything from there right away). I will see that emails that I wanted to keep have been suddenly added to the trash and they were never checked off to be moved, nor had I even clicked on them to look at them during that time frame. They might have been from the same day, or within the past few days. They are NOT always ones that are next to each other when in my inbox (so it is just random emails, not ones in a row). It is really **** me off to say the least, as I have to go and select them and move them back to my inbox manually (I have not seen ones from other folders end up in the trash, only inbox). If I were not keeping track of my trash folder and deleting it all once I have put stuff in there, I might never have noticed it doing this and would have lost MANY very important emails, and some other not so important ones. Why is this happening and what can I do to stop it? If it doesn't stop in the next day or 2, I will be forced to totally switch over to my Gmail account that I normally don't really use. This would mean transferring over all my email subscriptions to newsletters and other contacts etc, which would be a HUGE pain! I have had this email for about 13 years and do not want to give it up just because of some glitch with Outlook.com (which I have to say I REALLY HATE btw, I much preferred the Hotmail style I had before I was forced over).