No, there are too many architecture changes between the two versions (Vista and Designer) for a 5.5 Client to be able to connect to a 5.6 Primary. It's possible that Management Console and Reporter will work, but these are untested and unsupported scenarios.
Last Revised: October 16, 2007
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Legacy KB System (APS) Data: RESL188586 V1.0, Originally authored by KBAdPM on 10/24/2007, Last Edited by KBAdPM on 10/24/2007
Related ranges: ION Enterprise V5.6, ION Enterprise V5.5