After installing the December batch of updates from Microsoft, Outlook 2007 on my Windows Vista SP2 machine could not longer access my Gmail account using POP3. The error message was “Task ‘<gmail address> – Receiving’ reported error (0x800CCC18): ‘Your e-mail server rejected your login with Secure Password Authentication (SPA). …’ ” Uninstalling KB2412171solved the problem.
Update: Windows Secrets newsletter references this issue and links to a couple of discussions. http://windowssecrets.com/2010/12/16/07-PC-patches-end-this-year-with-a-bang