Microsoft is transitioning users to a "New Outlook" experience, but both versions are currently available: Deployment overview for the new Outlook for Windows
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Microsoft provides a specific landing page to Install or reinstall classic Outlook for users on new devices that only come with the "New" version pre-installed. System Requirements for Installation Microsoft is transitioning users to a "New Outlook"
Windows 11 or Windows 10 (Version 19041.0 or higher). Processor: 1.6 GHz or faster, 2-core. Memory (RAM): 4 GB (64-bit) or 2 GB (32-bit). Disk Space: At least 4 GB of available space. Display: 1280 x 768 or higher screen resolution. New vs. Classic Outlook: Which one do you need? Processor: 1
If you need the full-featured desktop version, sign in to your account at Microsoft365.com. Click "Install apps" and select "Microsoft 365 apps" to download the OfficeSetup.exe , which installs Outlook along with Word and Excel.
The quickest way for Windows 10/11 users. You can find and Get the new Outlook for Windows directly from the Microsoft Store for free.