Whata good email client for windows 9x? in Windows 9x/ME Posted January 29, 2013 Definitely not Outlook Express. It's a very insecure e-mail client. So much so that even Microsoft recommends against it.Personally I use SeaMonkey 1.1.19 as my internet suite, which includes an e-mail client. Otherwise there's the last Thunderbird 2.0.