Don't get me started on Outlook folders. The actual names are of the folders are localised, not just the way it's presented to the user. The folders are created when you first start Outlook (and not when your account is created).
If you happen to be using Windows configured in a foreign language the first time you start Outlook, your inbox, sent mail, etc, folders are named according to that language, and will never change, and you'll have to live with non-standard names for the folders.
At least its teaches you how to configure folders manually in most email clients.
That's why I take care that my OS doesn't know I'm French. But it's a luxury that most French people can't afford and they have to live with bugs. Ex: Having both a "Download" and a "Téléchargement" folder, with "Download" being sometimes translated.
This is something Apple got right. The underlying folder has a standard name, and the translated name is just a different presentation. If you change language, the names of the translated folders change.
For anyone who doesn't know OSX, this translation happens on the UI level. Typing ls in a terminal gives you the real directory name.
If you happen to be using Windows configured in a foreign language the first time you start Outlook, your inbox, sent mail, etc, folders are named according to that language, and will never change, and you'll have to live with non-standard names for the folders.
At least its teaches you how to configure folders manually in most email clients.