Does Microsoft Exchange need any special plan pricing?
You would need to either have an Office 365 subscription, a Microsoft live.com account with Outlook or individual purchase of Microsoft Exchange Online subscriptions.
On-premises Exchange servers are not supported.
Can I connect a self-hosted or third party-hosted version of Microsoft Exchange?
Only Microsoft-hosted versions of Microsoft Exchange can be connected to Zapier.
authorization failed: Error Fetching Calendars error
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