Exchange throttling: MAPI application fails with error “The information store could not be opened. [MAPI 1.0 – [MAPI_E_LOGON_FAILED(80040111)]]”

We recently resolved a case where a customer tries accessing Exchange Server 2010 mailboxes (DAG) via their custom Exchange MAPICDO based application. On average 2-3 days once, they’re frequently facing an error “The information store could not be opened. [MAPI 1.0 – [MAPI_E_LOGON_FAILED(80040111)]]” while attempting to connect to Exchange server 2010. After some days of…