3. Recommendations for Synchronization Clients (Mobile Devices)

By adhering to these recommendations server implementations can then reliably react to these 3 levels of support as defined in the following section. It is strongly encouraged that support for recurrence level 2 is provided in the client’s calendar store. This will ensure that the complex recurrences can received and displayed, even if the mobile user interface restricts the creation and modification of events to level 1 recurrences.