I was stupefied to see this screen in Outlook 2013:

As per ISO 8601:

The ISO 8601 definition for week 01 is the week with the Gregorian year's first Thursday in it. The following definitions based on properties of this week are mutually equivalent, since the ISO week starts with Monday:

Does Microsoft have such a basic thing wrong? Can it be fixed?

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3 Answers

Yes, you can set week numbering in Outlook:

• go to file - options
• in the left column select "Calendar"
• in the "work time" group there is a field "first week of year", here select "First 4-day week" (this is actually a synonym of the ISO definition)

Outlook uses whatever you set in its calendar options. The default setting is sometimes wrong and does not necessarily correlate with your Windows region settings.

This screenshot is from Outlook 2016 and in German, but the structure should also apply to Outlook 2013

Mac users may have noticed that their version of Outlook doesn't have the "first week of year" setting available. Instead, Outlook uses the settings configured in macOS.

Depending on your locale / region you might have the non-ISO behaviour by default. To change it, go to System Preferences –> Language & Region –> Calendar and change it from Gregorian to ISO 8601.

This setting applies to other apps as well, such as Apple's Calendar.app, as described in this answer on the Apple StackExchange.

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