We’ve all experienced the stomach drop that happens when you accidentally delete something. That’s why we’re big fans of backing things up, whether you’re on a PC, a Mac, Android, or iPhone. You can back up your Outlook .pst file like any other file—and you should, even if that means moving it from its default location—but that won’t help you recover an email that you just deleted accidentally.
Luckily, there’s a good chance you can recover your mistakenly deleted item if you’re using Microsoft Exchange Server as your mail server. (If you’re not, and you’re using a web-based mail address like Gmail or Yahoo! mail, your best option is to log into the web interface for your email and search there.)