Hi @Chen, Li-Juan (Louisa Chen, ES-Apps-GD-China-SH) ,
According to your description, do you mean you want to use the voting buttons feature in OWA?
If this is the case, agree with Reza that I am afraid it's not supported. As we can see from the image below, the Vote buttonis now only available to Outlook for PC:
See Compare Outlook for PC, Outlook on the web, and Outlook for iOS & Android.
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