This post show you How to solve 'Call was rejected by callee. (Exception from HRESULT: 0x80010001 (RPC_E_CALL_REJECTED))' when using c# with Microsoft Office Interop (e.g. Microsoft.Office.Interop.Word.Document).
.Net solving error: Call was rejected by callee
1. Active your Microsoft Office
2. Turn off all grammar / spelling functions
object newTemplate = false; object docType = 0; object isVisible = true; object missing = Type.Missing; oDoc = oWord.Documents.Add(ref missing, ref newTemplate, ref docType, ref isVisible); oDoc.ShowGrammaticalErrors = false; oDoc.ShowRevisions = false; oDoc.ShowSpellingErrors = false;