In Office 365 OWA it is possible to rename default folders like Inbox, Sent, Deleted, etc. to match specified language.
Sometimes you may receive following error message:
“The localization operation of the default folders of mailbox “someserver.prod.outlook.com/Microsoft Exchange Hosted Organizations/yourtenant.name/username” failed:Cannot localize the default folders.”
That message does not contain any explanations about possible reasons of that error.
One of the reason that can cause such error is that folder with such name is already exists. Sometimes users exporting their old folders into Office 365 and these folders have same names as default folders.
How it works: