ownCloud Desktop Client 2.2 is modest release that introduces a handful of new features, such as notifications for server events and sync issues, which will appear when the system administrator would like to put the ownCloud server in maintenance mode, or when the user can accept a new share.
In the same manner, users will get desktop notifications from the ownCloud client when a sync issue or a file conflict is being detected, allowing you to take action immediately instead of finding out much later (or never) that some of the files have not been synced due to various reasons.