The mail sync (MAGE) fails with - "Info Skipping message, size limit exceeded" or "Generic item processing error" (4254772)

Error found in the MAGE log
"2014-09-08    14:36:04.1951    Px11E8    TxE    A9    C1    M3    Info    Skipping message, size limit exceeded (message size - '108019561', size limit - '41943040', SourceKey - '787466B963019B47ADA9B1DA5F75151302793FDEF7D8')."

or

Error Generic item processing error [Message_ID] | System.Exception: The number of items in the Exchange server’s response () does not match the number of items for which uploading was attempted (20).

BY DEFAULT MAGE processes only 40meg batches or 32 items, whichever is reached first