Exchange 2013 EAC coexistence with Exchange 2007

Dear All,

I have an exchange organization comprized of single Exchange 2007 SP3 UR 15 running on Win2008 SP2 and two recently installed Exchange 2013 SP1 CU7 with CAS and Mailbox role running on Win 2012 R2.

Imidiantly after Exchange 2013 install, I am not able to login to Exchange 2013 EAC. When I enter my credentials domain\username, the EAC page simpli dose a quick refresh and I am back where I started.

I have tryid mutiple UTLs to access EAC page, such as:

https://localhost/ecp?ExchClientVer=15

https://localhost/ecp?ExchClientVer=14

https://localhost/ecp

Each of them show the same result, a page gets refreshet. I have tryid to move my Exchange Organization user mailbox to Exchange 2013 to see if that helps but the result.

I also noticed that OWA dosent work for mailboxes that are on Exchange 2013, they are redirected to Exchange 2007 even thou they are on Exchange 2013.

Any idea on this one?

Thank you

b.