In order to schedule Zoom meetings from within OWA, you would need to have the Zoom Addin Installed. Please see the following link for information on how to accomplish this: Installing-the-Zoom-for-Outlook-add-in
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@igornis the zoom add in for OWA ONLY available for Exchange 365 instances or is there a way to install it for third party hosted exchange users? Our hosted vendor is open to installing it on our instance, but the default way through the app store seems to be tied to Office 365.