Since Zimbra store provider uses local cache to store data, ZCB gives system administrators a way to limit the amount of mail/calendar that initially added to the cache. By default, only 2 days of mesasges/calendar is stored in the cache. The max age (in days) of emails and appointments that will be initially added to the cache can be set/changed using registry keys:
HKEY_LOCAL_MACHINE\Software\Zimbra\MaxInitialAge HKEY_LOCAL_MACHINE\Software\Zimbra\MaxInitialCalAg e
Basically, to sync old appointments, increase the value of 'MaxInitialCalAge', re-provision, wipe and activate user's device. |