Server Side email folders are folders in your email account that are stored on the central email server, not your local computer designated storage area. If you only use Mailman for email you probably do not have any server side email folders. Below is a picture of Server Side email folders in Thunderbird:
The folders outlined in red are Server Side email folders. Server Side email folders are stored with the rest of your server side folders, like your INBOX.
Server Side email folders and Local email folders are different. Local email folders store your email on your local computer storage area (e.g., your hard drive or a departmental server location), not the central email server. Below is a picture of Local email folders in Thunderbird
The folders outlined in red are Local email folders. Local email folders will not be affected by UNI’s migration to Collab.