
The information about the service pack can be found under Help -> About Microsoft® Office Outlook®.

Please don't mix the information about the service pack with the information about the OS. The service pack shown in the snapshot is only valid for Office (2000, XP and 2003). For Outlook® 2007 a Service-Pack 2 exists:
Current versions of service packs can be downloaded on the Microsoft® webpage.
On 7th February 2010 the buggy LiveUpdate function was replaced.
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