We've been informed by several readers that they've received updates from Microsoft in the last 24 hours (via Automatic Update or similar) that required a reboot.  Microsoft has apparently updated several of their bulletins.  Two of them are related to previous updates MSXML (v3.0 or v6.0), one with MSXML Core Services 4.0 SP2, one is additional daylight saving time updates, and the 4th is also daylight saving time-related and has to do with an error in the Date and Time control panel on Vista and Windows Server 2008.  While it isn't unusual for Microsoft to make some minor updates to bulletins and patches (especially detection fixes) at times other than "Patch Tuesday" some of our readers (and some of us, handlers) were surprised by updates that required reboot.

References:
Microsoft KB 973685
Microsoft KB 973687
Microsoft KB 973688
Microsoft KB 976098
Microsoft KB 976470  

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Jim Clausing, jclausing --at-- isc [dot] sans (dot) org