microsoft released a hotfix KB2899591 for outlook 2010. This hotfix adds mapi/http support for outlook 2010 clients. So now can switch if you are using exchange 2013 sp1 or later from rpc/http to MAPI/http.
See KB2899591 for the additional fixes that are included in hotfix as well.
You can request the hotfix for x86 and x64 versions of Outlook 2010 here.