Scheduling Poll is coming to Outlook for Windows soon!
Access Scheduling Poll
Scheduling Poll helps minimize the back-and-forth emails in scheduling by letting you send a poll to attendees inside and outside your organization, so they can vote on which meeting times work best for them.
Scheduling Poll can be accessed through the following Outlook clients.
Outlook on the Web
You can access Scheduling Poll through Mail or Calendar.
Create a new email or select an email to reply to. List required attendees for the meeting in the To field and optional attendees in the Cc field. Select Scheduling poll in the Message tab.
Create a new meeting event or select an existing event to edit it. List required attendees in the Invite attendees field and click the optional button to add optional attendees. Select Scheduling poll in the Event tab.
Outlook for Mac
Scheduling poll can be used in the New Outlook for Mac. You can access it through Mail:
Create a new email or select an email to reply to. List required attendees for the meeting in the To field and optional attendees in the Cc field. Select Scheduling Poll from the compose toolbar**.
Drag and drop Scheduling Poll into the toolbar.
Note: **If the find time add-in was previously installed, scheduling poll will automatically show on the toolbar, if not then it needs to be manually added by customizing the toolbar when composing a new mail. 
Outlook for Windows
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