Hi,
We are in co-existence with Exchange 2010 SP3 and Exchange 2013 CU3.
Outlook Anywhere and Autodiscover pointed towards Exchange 2013 CAS servers. Everything works fine irrespective where is mailbox is located Exchange 2010 or 2013.
When I tried to access auto-mapped mailbox from Exchange 2010 as primary mailbox accessing auto-mapped Exchange 2013 mailbox "Cannot expand the folder. The set of folders cannot be opened. Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance".
Exchange 2013 OutlookAnywhere "Externalclientauthenticationmethod" is Basic and "Internalclientauthencitcationmethod" is NTLM. Everything is setup as per the Tech-net recommendations.
Checked both these articles but still it is not working:
http://support.microsoft.com/kb/2839517
http://support.microsoft.com/kb/2834139
Please let me know if there are any other ideas.
Raman
