John Compton
Pathfinder Society Lead Developer
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Just around the office, I've heard only "zee." That likely is because the Paizo office consists largely of those raised and educated in the United States of America, so hearing "haitch" (for the letter h, rather than "aitch") and "nought" (rather than zero or "oh") is likewise rare.
Ultimately, I'd pronounce it however best suits your group. For me, that's Conference Zee.