I installed my first Exchnage 2010 server with CAS, HT and MB role. My users are still on Exchnage 2007 Sp2 server. OWA is working perfectly fine for legacy as well as Exchnage 2010 test user. But ActiveSync is not working for Exchnage 2007 users. It is working fine for Exchnage 2010 test user though. Also I noticed that ActiveSync works fine with legacy.domain.com url inplace of main url (mail.domain.com). I have entered https://legacy.domain.com in extrenal url for activesync. Any ideas for this behaviour.?