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What kind of SOAP requests can we use to query the changes for calendar and contacts on the server? Another word, how do we determine what items have been modified, added and deleted since the last time we queried the server for data? Thanks!
The SOAP api has a SyncRequest command which will give you an initial sync of all the data and then ongoing delta syncs of changes. See sync.txt in ZimbraServer/docs/ for more details.
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query data changes on server through SOAP 
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