I find the zimbra desktop import and export tool is very good, It support the TGZ file format. but some time i forgot to using export tool to backup my email data,
i found under C:\username\Appdata\local\zimbra\zimbradesktop\store\0 there are many msg file, this must be my email data, then i wonder how i can directly backup those data and import or open those msg file. because in some urgent case , like reinstall operation system we want to open email data quickly.