I  am using many email client but i am not satisfied but while switching from one to another client finally found outlook usefull as my requirement. i face some problem such as how convert .eml to .mbox . i helped for google find many tool. but some tool not secure and not properly working. i asked  my friend then suggested eml to msg converter. i suggested all of you read more and download free :  http://www.toolsbaer.com/eml-to-msg-conversion/