HOTSPOT
Your company has an Exchange Server 2013 organization named contoso.com.
All users run Microsoft Outlook 2010 or Outlook 2013.
The company recently acquired another company named
A.
Datum Corporation. All of the users at A. Datum run Linux-based computers and use a third-party
IMAP client to access their email messages.
You configure IMAP over SSL to use the external URL of mail.contoso.com.
You need to publish the IMAP settings to Outlook Web App.
What command should you run? (To answer, select the appropriate options in the answer area,) 
Set-IMAPSettings -ExternalConnectionSettings “mail.contoso.com:143:tls”
Set-ReceiveConnector -Identity “hubtransport\Client HUBTRANSPORT” -AdvertiseClientSettings:$true
Thanks to: http://www.stevieg.org/2010/08/publishing-imap-pop-and-smtp-settings-via-exchange-2010-owa/
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Thanks!
For each protocol you specify a colon-separated list of values for the ExternalConnectionSettings. For POP3 with TLS, this might be “casserver.contoso.com:110:tls” or POP3 with SSL might be “casserver.contoso.com:995:ssl”. IMAP with TLS might be “casserver.contoso.com:143:tls” and IMAP with SSL might be “casserver.contoso.com:993:ssl”.
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The answer is Set-IMAPSettings -ExternalConnectionSettings “mail.contoso.com:993:SSL
Not 143:tls
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Agree with RA, port 143 seems to be for TLS and 993 for SSL – https://www.arclab.com/en/kb/email/list-of-smtp-and-imap-servers-mailserver-list.html
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Also looks like you would run Set-ReceiveConnector -Identity -AdvertiseClientSettings:$true after this to ensure the settings can be seen.
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The question says “You configure IMAP over SSL to use the external URL of mail.contoso.com.”
So Set-IMAPSettings -ExternalConnectionSettings “mail.contoso.com:993:SSL cant be the answer, becuase you would have already completed this. I agree with Joe, you would need to run “Set-ReceiveConnector -Identity -AdvertiseClientSettings:$true” to make IMAP settings are visible.
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See the answer: mail.contoso.com:143:SSL <<< this is not SSL port, it is TLS port, that's why this answer is wrong, 993:SSL should be right
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