The iFolder 2.1 client cannot access an iFolder 1.x server; similarly, an iFolder 1.x client cannot access an iFolder 2.1 server. If you have multiple iFolder versions available in your environment, make sure your users have the right client software for accounts located on different servers. Make sure the users understand that they must access the iFolder server with the correct version of the iFolder client. For example, use the iFolder 2.1 client to access files on an iFolder 2.1 server.