Microsoft Outlook uses a file called the Offline Address Book (OAB) to store email information about your contacts. It is stored locally on every machine that has Outlook installed. When you type someone's name and it shows their email, this file is where that comes from.
For 20 years, only Microsoft knew how to read the OAB file... until antimatter15 figured it out in 2014.
Sadly, their code hasn't been updated in a long time, and it no longer works. They named the script BOA, so with some try catches, I did my best to patch BOA up.