How to Open People app in Windows 10
The People app is your address book. You can add your contacts and keep in touch with friends and family. The People, Mail, and Calendar apps work together so you can easily send mail to and schedule appointments with your most important people. Delete contacts.
Effective January 29, 2021, the People app will no longer be able to be launched directly (for example, through the Start Menu or search bar) in Windows 10. You'll still be able to launch it through the People icons in Mail, Calendar, and other apps.
See also: People app help | Microsoft Support
This tutorial will show you different ways on how to open the People app in Windows 10.
EXAMPLE: People app

OPTION ONE
Open People app from People Button on Taskbar
1 Click/tap on the
People button on the taskbar. (see screenshot below)
2 Click/tap on the
Apps tab.
3 Click/tap on the
People app.

OPTION TWO
Open People app from Mail app
1 Open the
Mail app ("outlookmail:")
2 Click/tap on the
Switch to People icon at the bottom left. (see screenshot below)

OPTION THREE
Open People app from Calendar app
1 Open the
Calendar app ("outlookcal:")
2 Click/tap on the
Switch to People icon at the bottom left. (see screenshot below)

OPTION FOUR
Open People app from Run
1 Open the
Run (Win+R) command dialog.
2 Copy and paste
ms-people:
into Run, and click/tap on
OK.

OPTION FIVE
Open People app from Command Prompt
1 Open a
command prompt.
2 Copy and paste
start ms-people:
into the command prompt, and press
Enter.

OPTION SIX
Open People app from PowerShell
1 Open a
PowerShell.
2 Copy and paste
start ms-people:
into PowerShell, and press
Enter.

That's it,
Shawn Brink