{"draft":"","doc_id":"RFC1328","title":" X.400 1988 to 1984 downgrading ","authors":["S. Hardcastle-Kille"],"format":["ASCII","HTML"],"page_count":"5","pub_status":"PROPOSED STANDARD","status":"HISTORIC","source":"Legacy","abstract":" This document considers issues of downgrading from X.400(1988) to X.400(1984) [MHS88a, MHS84].  Annexe B of X.419 specifies some downgrading rules [MHS88b], but these are not sufficient for provision of service in an environment containing both 1984 and 1988 components. This document defines a number of extensions to this annexe. [STANDARDS-TRACK]  ","pub_date":"April 1992","keywords":["Electronic-mail","message handling systems","mail"],"obsoletes":[],"obsoleted_by":[],"updates":[],"updated_by":[],"see_also":[],"doi":"10.17487\/RFC1328","errata_url":null}