Week numbers are wrong

I’ve added week numbers to my Calendar but they don’t seem to match with my desk calendar which I believe is correct.
How can this be and how can I correct this?

There are several week numbering systems in use for the normal (Gregorian) calendar. The week numbering system of Outlook can be modified to match the numbering system which is used by your country.

There are 2 settings that determine the week numbers that are listed in the calendar;
-First day of week
-First week of year

You can find these options by going to;

  • Outlook 2007 and previous
    Tools-> Options…-> button Calendar Options…
  • Outlook 2010
    File-> section Options-> section Calendar

Examples
If you live in the USA, Canada, Australia, New Zealand or the UK, you most likely need to set these options to;
-First day of week: Sunday
-First week of year: Starts on Jan 1

If you live in Europe (except for the UK) or want to follow the ISO standards, you most likely need to set these options to;
-First day of week: Monday
-First week of year: First 4-day week

Note: In the UK, as of 2004, according to the British Standard, the official first day of the week is Monday. Whether or not you should select the corresponding option depends on the level of acceptance of that standard in your sector/area.

Background info
The initial settings for Outlook are determined by the regional settings of your Windows version. You can change your regional settings (language, location, date notation, etc…) in the Windows Control Panel. You can then use the settings in Outlook to overrule the week numbering system.

This method is useful when you are using a language of Windows that doesn’t match with the language of your regional settings. In those cases the names of the days will be translated to the language that is set in your regional settings, creating a mixed language environment which often is not desired.

For instance;
Your Windows version is in English but the names of the days will be displayed in Dutch.
By setting the language to an English format (and possibly additionally changing the formatting options in Control Panel), you can maintain a fully English working environment and use the options in Outlook to match the week numbering system of your region.

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