I am using EWS (direct XML, not the managed API) to create contact groups in Office 365. When I reach 302 members, EWS will respond with "CorruptData". I don't think my data is corrupt, because I have experimented with various sets that work fine, only fail when that number is reached. I am using extended property ids 32852 and 32853 (binary arrays) to set the one-off member data. Any idea why this limitation is present, and what I can do about it?
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