Did you install the Microsoft Office Compatibility Pack for Word, Excel, and
PowerPoint 2007 File Formats? If yes, this is why you are being offered
SP1.

"Don Gollahon" wrote in message
...
I have Office 2003 on my Vista Home Premium. Yet Windows Update wants
to install SP1 for Office 2007. Won't that mess up my office apps?

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Don Gollahon