After upgrading a client from Office 2010 to Office 2016 we have noticed a problem with folder names.  If the user creates a folder with a Space on the end, Outlook will stop synchronizing and the SmarterMail logs will show an error trying to create the new folder name.

Wasn't a problem in Outlook 2010 as I think if the folder couldn't be created on the server, Outlook 2010 wouldn't create it on the client.