Using Classic Outlook on Windows for personal email, calendar, and contact management
Based on my experience today (February 21, 2025) it depends on how you install Microsoft 365. First you have to download for offline installation, not whatever it wants to do from your browser. Then it looks like if you download it for offline installation, there are three different Setup files you can choose. The first one presented installs only Outlook (new). But if you look into the Folder, there are two others and one of them installed both Outlook (new) and Outlook (classic) for me.