After upgrading to SEP 12.1 RU4 64-bit, Outlook 2007 stops receiving POP3 emails
I have Windows 7 Home (64-bit), Outlook 2007 SP3, and SEP (unmanaged) installed.
I recently upgraded SEP from 12.1 RU3 to 12.1 RU4. As soon the update finished, Outlook stopped receiving emails via POP3 (and eventually generates an 0x8004210A error). Tried reboots, re-installing Outlook and SEP.
The problem appears to be triggered by SEP's Internet Email Auto-Protect function: when I turn this function off, Outlook sends/receives successfully; turn the function back on and Outlook stops receiving (but can send). I have confirmed the inbound/outbound port between Outlook and SEP.