Adding week numbers to Outlook 2013 was actually the first thing I did after installing Office 2013 last week. I work with a lot of Europeans and they love to refer to week numbers during project so this is a must for any install of Office. For those of you not yet running Office 2013, this feature is also available in Office 2007 or Office 2010 so take a look at that old groovyPost to enable it.
Add Week Numbers to Outlook 2013 Calendar
Start by opening Outlook 2013 and Click File.
Under Display Options, Click show week numbers in the month view and in the Date Navigator
And there ya go – Week Numbers should now be displayed on the Calendar Navigation view and horizontally in the Main calendar as highlighted below.