Calendar Connector for Exchange enables a two-way, efficient synchronization between Liferay and Exchange Server. This lets users who own an Exchange mailbox to see their calendars and manage events on Liferay, just by logging in and using Liferay's Calendar portlet on a portal page. Liferay and Exchange calendars are "paired" during configuration thanks to an intuitive and easy-to-use interface, and so all changes occurred in these calendars are automatically propagated on both sides through a periodic background process. All these changes are tracked and propagated:

creation of new events
update in the details of an event, and also in recurrence settings, such as creating a recurrence exception
deletion of events (with or without Recycle Bin enabled)
creation of meeting requests
update in the accepted/declined status of a meeting invitation
Please visit our link for documentations and manuals:

https://liferaypartneritalia.smc.it/calendar-connector-for-exchange