How to show the week numbers in Calendar in Outlook?
Let’s say you will make work schedule from the 20th week to 25th week in this year. It may be hard to quickly figure out which days the 20th - 25th weeks include. Actually, we can display the week numbers before calendars in Outlook. Here we will discuss how to show the week numbers in Calendar in Microsoft Outlook.

Show week number in Calendar in Outlook 2010 and 2013
Show week number in Calendar in Outlook 2007
Show week numbers in Calendar in Outlook 2010 and 2013
To show week numbers in Calendar in Microsoft Outlook 2010 and 2013, please do as following:
Step 1: Click the File > Options.
Step 2: In the Outlook Options dialog box, click the Calendar in the left bar.
Step 3: Go to the Display options section, and check the option of Show week numbers in the month view and in the Date Navigator. See the following screen shot:

Step 4: Click the OK button.
Then the week numbers have been added in the Date navigator in the To-Do Bar. By the way, you can open the To-Do Bar with clicking the View > To-Do Bar > Normal.
Step 5: Shift to the Calendar view with clicking the Calendar in the Navigation Pane, and open a calendar.
Step 6: Display the calendar in month view with clicking the Month button on View tab.
Then you will see the week numbers appear before the opened calendar. See screen shot:

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Show week numbers in Calendar in Outlook 2007
If you are using Microsoft Outlook 2007, you can show week numbers in Calendars with following steps:
Step 1: Click the Tools > Options.
Step 2: In the Options dialog box, click the Calendar Options button on the Preferences tab.

Step 3: In the Calendar Options dialog box, check the option of Show week numbers in the Month view and Date Navigator in the Calendar options section. See screen shot:

Step 4: Click all OK buttons in each dialog box.
Step 5: Shift to the Calendar view with clicking the Calendar in the Navigation Pane.
Step 6: Open a calendar, and display it in month view with clicking the Month button at the top of this calendar.
Then you will see the week numbers appear before the opened calendar and in the Date Navigator.
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