
Hey there Vladyslav!
This preview version starts automatically if Outlook is opened, so you should be able to add the original to the startup to accomplish this.
Otherwise, we can add it manually just to be on the safe side!
- Open File Explorer and head to C:\Program Files\WindowsApps\Microsoft.OutlookForWindows_1.2023.1018.300_x64__8wekyb3d8bbwe and locate olk.exe
- This is the home folder for the preview app.
- Hold Win+R to open the Run menu and type in shell:startup to open the Startup folder
- Right-click olk.exe and drag it to the Startup folder > Select Create Shortcut Here
The preview version should now auto-open upon login :) Let me know if that did the trick!