Lync client cannot connect to Exchange Server when accessing from outside (Internet) - please HELP!

Hello,
I have full representation of the Lync 2010 from Outside (i.e. Internet), but I still have small issue related to Lync-to-Exchange integration. Clients who is using Lync client from outside (i.e. Internet) cannot see Exchange-related information including
Call Logs, Voicemail and Calendar information.
Here is the experience and error messages that anyone will see when connecting to Lync server from Outside:
And this is the error message that will be displayed on Lync phone edition devices (a.g. Polycom CX-700) when connected from Internet:
If somebody can suggest what I can try I would appreciate this very much. I do believe that many other people have this issue as well.
Thanks!

Hi, we had this issue and I ended up logging a MS support job. Turns out it was the TMG rule/Auth method causing the issue.
Job details:
**Symptom:
Lync Client External User are not able to retrieve the EWS URL
**Troubleshooting:
• We found External users are not able to Retrieve the EWS information in the Lync Client .
• We found the below error in the ETL logs.We found for EWS request we are getting the  401 response
HTTP/1.1 401 Unauthorized ( The server requires authorization to fulfill the request. Access to the Web server is denied. Contact the server administrator.  )
• TMG need pass through Authentication
Public names are  autodiscover.domain.com and Outlook anywhere External FQDN  and paths are /ews/* and /autodiscover/*, OAB/*
Users is All Users, and Delegation is "No delegation but client may authenticate directly" on the corresponding tabs of the publishing rule.
This changes is required for Lync Client as Lync Client does not  work well with this BASIC authentication on TMG .
• After  TMG engineer changed this settings in the TMG users are able to see EWS information.
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