When synchronizing all visible contact folders inside a single aggrgated collection to the client, this oftne results in a huge amount of contacts the client is not able to handle very well.

Since there is currently no graphical frontend for the user to control which folders are synchronized to his clients, a new configuration setting is introduced to control the used folders for the aggregated contact collection in the CardDAV interface:

# Specifies if all visible folders are used to create the aggregated
# collection, or if a reduced set of folders only containing the global
# addressbook and the personal contacts folders should be used. This setting
# only influences the aggregated collection that is used for clients that
# don't support multiple collections. Possible values are 'true' and 'false.
com.openexchange.carddav.reducedAggregatedCollecti on=true