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Choose a meeting or appointment and then select the Meeting or Appointment tab and then chooseÂ
​​​​​​​ Categorize in classic Outlook. -
Select a color category. The first time you select a new category, you can:
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Add a more descriptive name.Â
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Add a keyboard shortcut key. This lets you quickly assign categories on selected meetings and appointments by pressing the shortcut key.
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Customize the color.
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To categorize meetings or appointments, see Assign categories to messages.
Tip:Â Select
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In the new OutlookÂ
 Calendar, double-click an event to open it. -
On the toolbar, selectÂ
 Categorize, then select a category from the menu.If Categorize is grayed out, it's because you've opened an event that is part of a series. Next to the date, select  View series. Then the Categorize option will become available.