Outlook would change some all-day events to events spanning from 1 AM one day
to 1 AM the next day due to the change in the date that DST starts this year.
The patch fixes that issue, from what I understand.

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Jocelyn Fiorello
MVP - Outlook
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> I am having difficulty finding any information on the necessity of the patch
> officexp-KB933588-ENU.exe. I am subscribed to the "Daylight Saving Time
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>
> Thanks.