One of my folders is not showing any data, it’s a folder in Outlook.com from another account on pop3 that was automatically created. I tried doing some cleaning but the folder still shows it’s empty even if I have several subfolders in it.
I’m pretty sure it’s a bug. I don’t have this bug with other e-mail clients.
You should be able to rename any folders except the system folders using the web interface for your account. If you can’t, maybe contact Outlook.com Support. They are usually quite helpful.
All right I did it, but the subfolder is still not visible and I don’t receive my e-mails now (in Outlook.com), remember, this is a connected account using Pop3 within Outlook.com