We've added a new whitepaper to the Isode site, "Access, Replication and Synchronization for Mobile Email Devices"
Mobile devices are increasingly tasked with handling email and associated data, such as address books and calendar information. The paper examines the many approaches to getting data onto to and off of the mobile device, looks at synchronization issues between the mobile device, desktop and server, outlines the Open Standards protocols designed to address these issues and recommends a model for mobile and desktop access to email, address book and calendars.
Particular attention is paid to the two main evolving standards designed to address these issues, The Internet Engineering Task Force's proposed LEMONADE standard and SyncML. The OMA (Open Mobile Alliance) is evaluating both these options for supporting mobile email devices. The paper suggests that these two options are complementary, not competitive with SyncML used for synchronizing personal calendars and address books, as it is ideal for these functions and LEMONADE (based on IMAP/SMTP) used for email as SyncML does not have adequate functionality to support the same wide range of usage scenarios.
You can read more here.