Exchange 2010 and email access via pop3 for outlook 2003,2007,2010 from outside & Ipad

Hi
I have got sbs 2010 with exchange 2010 and the domain is abc.local. Now all the exchange services  like pop3,imap etc are on automatic and started. i also check the exchange console for server components & receipt. components etc,,, those all are fine. when i try to access pop3 emails from external network via outlook it is asking for the username and password again .( i have already forwarded the ports 110,443,143 etc to ther server.so please tell me what i am doing wrong?
i cant access owa from outside either via the https://ipaddress/exchange it gives"

Server Error in '/' Application.
--------------------------------------------------------------------------------

Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".


<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="Off"/>
    </system.web>
</configuration>
 

Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.


<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
    </system.web>
</configuration>
 

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Ipad and black berry is not working as well...
I hv to configure exchange for ipad and also configure ipad via microsoft exchange+imap but still not working..please tell me how to configure exchange in details so, we can access the email via ipad from outside.