Lync 2010 iPhone - Can't connect to Exchange web server. you can try again later

Hi there,
I installed Lync 2010 mobility, and works fine, but iPhone users have a :
Can't connect to Exchange web server.
you can try again later
Now does this have anything to do with it? And how do i fix it? I searched but nothing relevant

Total server discovery time: 0.3 seconds
Starting Lync server autodiscovery
Please wait; this test may take several minutes to complete...
Starting automatic discovery for secure (HTTPS) internal channel
Server discovery has completed for https://lyncdiscoverinternal.contoso.com/.
Automatic discovery results for https://lyncdiscoverinternal.contoso.com/
Access Location                          : Internal
SIP Server Internal Access               : server.contoso.com
SIP Server External Access               : sip.contoso.com
SIP Client Internal Access               : server.contoso.com
SIP Client External Access               : sip.contoso.com
Internal Auth broker service             : https://server.contoso.com/Reach/sip.svc
External Auth broker service             : https://lync.contoso.com/Reach/sip.svc
Internal Auto discover service           : https://server.contoso.com/Autodiscover/AutodiscoverService.svc/root
External Auto discover service           : https://lync.contoso.com/Autodiscover/AutodiscoverService.svc/root
Internal MCX service                     : https://lync.contoso.com/Mcx/McxService.svc
External MCX service                     : https://lync.contoso.com/Mcx/McxService.svc
Internal UCWA service                    : service URL is empty in the discovery response
External UCWA service                    : service URL is empty in the discovery response
Internal Webscheduler service            : service URL is empty in the discovery response
External Webscheduler service            : service URL is empty in the discovery response
Server discovery succeeded for secure (HTTPS) internal channel against URL https://lyncdiscoverinternal.contoso.com/
Starting automatic discovery for unsecure (HTTP) internal channel
Couldn't connect to URL http://lyncdiscoverinternal.contoso.com/[email protected] (HTTP status code Forbidden)
Server discovery failed for unsecured internal channel against http://lyncdiscoverinternal.contoso.com/
Starting automatic discovery for secure (HTTPS) external channel

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