The default settings in Exchange 2010/SBS 2011 do not advertise these to the user under OWA. If you do enable services such as POP or IMAP the settings are not updated and you need to update these yourselves.

Enable POP3 or IMAP in Exchange 2010/SBS 2008 / 2011 by performing the following :

http://blogs.technet.com/b/sbs/archive/2008/09/19/how-to-configure-sbs-2008-to-host-pop3-imap4.aspx

Check in Outlook all working OK by using the following settings

http://blogs.technet.com/b/sbs/archive/2011/08/31/how-to-configure-outlook-for-pop3-imap-and-smtp-connectivity-in-sbs-2008-2011-standard.asp

Once ok , advertise the settings that work in OWA by

Open Exchange Shell , Run these for replacing with your correct domain and pop / imap settings

Set-POPSettings -ExternalConnectionSettings “mail.contoso.com:995:ssl”
Set-IMAPSettings -ExternalConnectionSettings “mail.contoso.com:143:tls”

For SMTP , it uses is the FQDN value on the chosen receive connector. You can find this in the Exchange console via Configuration>Hub Transport>Receive Connectors, Right clicking and choosing Properties on the chosen receive connector.

Once all your settings have been correctly updated, Run this to find your Hubtransport Identity

Get-ReceiveConnector |FL Identity

Then Run this to publish the settings

Set-ReceiveConnector -Identity “**YOUR IDENTITY FROM ABOVE**” -AdvertiseClientSettings:$true

Open Internet Information Services in Administrative Tools

Right click on the server, Stop and Start

You should see the new settings updated