Question : Problem: iPhone 3G 2.1 can not sync with exchange "Outside" LAN

Hello and thanks in advance,
we have Windows 2003 Small Bus. and Exchange 2003 SP 2
i have configured the iphone to sync with exchange and it does with no problem with i am inside the network, but as soon as i switch to 3G or use Wifi at home, it keep giving me the error msg "The connection to the server has failed"
things i tried
access to OWA from outside = works
acc OMA from outside =works (owa.company.com/oma)
i get this when accessing OMA using IE 7.

The device type you are using is not supported. Press Ok to continue.

Ok
Ok, and do not warn me again
and when i click ok i see a text version of my inbox

access to OMA from iPhone when over 3G works (same msg. as above comes)

can someone please help me.
Thank you,

Answer : Problem: iPhone 3G 2.1 can not sync with exchange "Outside" LAN

I cant believe it ! i solved it !!! the problem was the active sync service in IIS was only accepting connection from INSIDE the network, dont know how i missed it !!!! :)