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Exchange SE HU6: PDF attachments truncated to 13 KB via Outlook Desktop — OWA unaffected
We've spent days isolating this and ruled out everything we could touch. The corruption survives agent disabling, Bitdefender removal, and BypassFiltering — and the message tracking logs show exactly...
The issue has been independently reproduced on a second Exchange Server SE on-premises environment (confirmed by external consultant). This confirms the bug is not environment-specific.