更多第三方程序:
Spanning Sync (iCal - $25/year), BusySync (iCal - $25), Calgoo (iCal/Outlook - free), SyncMyCal (Outlook - $25), gSyncit (Outlook - $10), GCALDaemon (cross-platform/open source), Plaxo (cross-platform/free), GCalSync (Java mobile app - open source), GooSync (SyncML service/mobile app - £20/year), GMobileSync (Windows Mobile - open source), OggSync (Windows Mobile/Outlook - $30/year).
这里 有更多说明信息,如果您使用iCal,需要参看the known issues.