To cut a long story short, each time he tried to switch the keyboard to EL (Greek), it would hung with no exception. Several times it even crashed by itself while (re)starting. Repairing the .pst file did not help. After realizing it was switching the keyboard that did this, I googled the issue and found the thread “Outlook 2007 crash when I typing Thai language“. Result: No solution or workaround (yet), but Outlook Connector was to blame.
Well, not any more, it’s gone now and we all are back in business. I was very reluctant to recommend Outlook Connector to begin with, but there were no issues with it for weeks. What can I say? Can’t tie the issue to an update, either.
Sorry for not troubleshooting this further, MS, we both had real work to get done…
Update Nov. 24, 2010: According to “Solved: Outlook 2007 hangs when switching language” post #7, “… there is a new release of Outlook Connector (Ver 14) and it should fix this problem …”. Find it in http://download.microsoft.com/downlo…kConnector.exe.