iOS 13 sync
Question asked by ram - 11/4/2019 at 11:28 PM
Answered
To sync an email account in iOS 13, I need EAS service or EWS/MAPI service?
Alex Clarke Replied
You can use IMAP (at no extra cost) or purchase some EAS licenses and use one of those.

EAS will also sync your calendar and contacts too. 
ram Replied
And what is EWS/MAPI service?
Employee Replied
Employee Post Marked As Answer
Ram,

This article should be helpful with regards to what the different protocols are for:

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