I-Microsoft izenzele eyayo i-""communication protocol"" (okanye uthotho lwemithetho yayo) yokuthumela okanye yokufumana i-mail okanye imbalelwano, ezizwa ngokuba yi-""Exchange"". I-exchange protocol isebenza ngokwahlukile geqe kwindlela yesiqhelo kwaye ke eyayo indlela ayichazwanga apha.