The Exchange support team relatively frequently receives cases where mobile devices using Exchange ActiveSync (EAS) protocol send too many requests to Exchange server resulting in a situation where server runs out of resources, effectively causing a ‘denial of service’ (DOS) attack. The worst outcome of such a situation is that the server also becomes unavailable to other users who may not be using EAS protocol to connect. We have documented this issue with possible mitigations in the following KnowledgeBase article:


2469722 Unable to connect using Exchange ActiveSync due to Exchange resource consumption


A recent example of this issue was Apple iOS 4.0 ...


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A script to troubleshoot issues with Exchange ActiveSync - Exchange Team Blog - Site Home - TechNet Blogs

Kindest regards,


João Ribeiro