Hi @Nikhil Rane ,
Welcome to our forum!
What do you mean about "Web addin"?
As i know, Web add-ins (Integrations built on Outlook using COM integration) is available in New Outlook for Windows.
![5](https://learn-attachment.microsoft.com/api/attachments/0c7aa16a-5bac-422a-8bbe-c4766dce73f2?platform=QnA)
More information about New Outlook for Windows:
Getting started with the new Outlook for Windows
Hope to help you!
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