Why are some Outlook Folders local and others global (on the mailserver)

[Berger58]

Hello,

I'm using Microsoft Outlook 2016, when I create a New Folder by "Right click -> New Folder" It creates an Folder which is sometimes called "Some Folder (only on this machine)" and sometimes "Another Folder". The "Another Folder" is also available on the mailserver, the other (obviously) not. How can I set the folders always to be available on the mailserver too?

Best regards

Kevin

[#2]

I found the solution: if the folder contains not allowed characters in the folder name like "/" it is not synced to the server. I renamed the folder after I created it, thus all the new folders couldn't be synced.