Whenever you change Regional & Time settings in OWA to change the Language for default folders get this error:

“The localization operation of the default folders of mailbox”


Consider an example to change it to Nederlands Language which is Dutch & for some reason (Could be Old mails imports) or manual creation If there is another folder called “Postvak In” means “Inbox” So changing the Language to Dutch(nl.NL) Office 365 server tries to change the folder named Inbox to “Postvak In”, Since there is another folder with the same name it errors out as above.


Locate the Default Folder which has the language of the one you trying to change & Re-name it.


By Kingson Jebaraj

Microsoft MVP, Blogger, Owner and Publisher for, Microsoft TechNet Author, Solution Architect, Former Office365 Technical Lead for Microsoft(Partner) Extensive knowledge and experience in Microsoft Exchange and Cloud Messaging Services and has got more exposure on Messaging environment deployment,migration,designing and other project management activities, I have earned real time experience in handling multi-site distributed critical large environment of messaging system. Been awarded as an MVP (Microsoft Most Valuable Professional) for Office Servers and services from Microsoft for an exceptional real world contribution made through Microsoft forums and other Microsoft communities. Currently working as “Solution Architect” on Private/Public cloud and SaaS environment for Pacific Controls, UAE, Dubai. One of the largest TIER III certified green data center campus in the middle east.

2 thoughts on “The localization operation of the default folders of mailbox”
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