That depends on your keyboard layout. On my Swedish keyboard I can use one of AltGr-5 and AltGr-E (or Ctrl-Alt-5/E), but that may not work with your keyboard layout.
ALT-0128 works universally, but that's a little more cumbersome.
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How do I entering the euro sign in Outlook on desktop Windows 11? Previous answer of using alt 1028 NOT working
That depends on your keyboard layout. On my Swedish keyboard I can use one of AltGr-5 and AltGr-E (or Ctrl-Alt-5/E), but that may not work with your keyboard layout.
ALT-0128 works universally, but that's a little more cumbersome.
AI answer
To type the euro (€) sign in Outlook on desktop Windows 11, use the correct Alt code on the numeric keypad:
This works in Outlook and other apps that accept standard Windows Alt codes.
References: