I cannot seem to locate some of my e-mail messages associated with an ongoing e-mail correspondence?
Some messages that are part of an ongoing correspondence may show within a threaded message. To view these messages you may need to expand the threaded view of a correspondence. Users may find it helpful to disable this type of grouping which is called 'conversations'. The following guide will walk you through how to disable this feature. 0365 - Disable viewing your messages as a conversation to see each message individually