From the title you can guess that we have Exchange 2010 (SP1 CU6 - with Hotfix for EVault) and we are using NetScaler VPX to load balance the services. I used the excellent document from Citrix to configure the NetScalers (we have two in active/active - sort of using VMACs to split the traffic RPC to one, HTTP(S) and SMTP to the other). However I found a document from Microsoft which points out that there is "significant performance penalty" if we configure incorrect persistence for EAS. The Microsoft document is here: http://technet.microsoft.com/en-us/library/ff625248.aspx This put us in a pickle and no mistake. This is because in a NetScaler persistence is per vServer. We have one vServer for HTTPS as we have one IP address for all HTTP traffic. This vServer would then deal with all HTTPS traffic including OWA,ECP,EWS,RPC over HTTPS and EAS. OWA requires cookie based persistence, this is also the method the Citrix document recommends. From the Micros
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