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In case you don't already know, the ActivityId is something we use to correlate trace events when logging so we know which 'start' goes with which 'stop' on a busy server. I wrote about it in this post. Immediately after that post I blogged about a custom WCF message inspector that smuggled the ActivityId in a header. It turns out this was (almost*) superfluous as the WCF had recognised this as a common thing to want to do and added it as a feature.