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Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
4,364 questions
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Hi
paul
Thank you for reaching out Microsoft Community to share your issue.
I would like to know that is it a User mailbox or shared mailbox. Can you please check the proper permission has given to user.
Refer Thread: https://answers.microsoft.com/en-us/outlook_com/forum/all/cannot-create-subfolders/eaeadba5-2006-4fb5-80cd-e2db641cd3fe