If your firm has an active website, you'll need an email for official communication. Below, we'll go over everything you need to know about Office 365 hosting.
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What is Office 365 Hosting & Email Setup
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Sending to Office 365 groups (EWS configuration) - JungleMail documentation
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Email Client Setup: Outlook 2016, 2019, and Outlook 365
How to set up email hosting with Microsoft office 365 - Ozhosting Solutions