Hotfix KB2899591 for Outlook 2010 add support for MAPI/HTTP

released a hotfix  KB2899591 for . This hotfix adds MAPI/http support for 2010 clients. So now can switch if you are using 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.