eM Client can also synchronize all your calendar, contacts or tasks items if your server supports the CalDAV or CardDAV protocol. An example of a service that uses both of these protocols would be Fruux. You can also synchronize your Google calendar and Google contacts.

If your provider doesn’t support the synchronization of any of these items, you can always use the local calendar, contacts and tasks. Please keep in mind that items saved locally can not be synchronized.