This could be the most boring thread ever, or a classic.
Microsoft Word and Outlook use a shared custom dictionary.
This is where words get added if you click on 'ADD' when the spell-checker doesn't know them, but you know it's a real word.
I changed jobs recently, so mine's not got very many words in yet. I wish I'd saved the list at my last place, there were hundreds of words, giving a small insight into what I spend the day thinking about!
This is my list in four weeks at the new job:
Bently Bjork Bjork's C Cheadle DCS Einar ESD Laureen MCC Molenbrook meithered Saville Sugarcubes t'internet