Where does Postbox store my profile and emails?

This is handy to know if you want to manually back up your Postbox settings and the mail stored in Postbox.

Mac OS X:

~/Library/Application Support/Postbox 

Note: In Mac OS X 10.7 "Lion" the Library folder is hidden. To access it, Open Finder, and hold the Option key while clicking on the Go menu at the top of the screen. "Library" will be one of the options.

Additionally, to unhide it permanently, open a Terminal window and type:

chflags nohidden /Users/[username]/Library

Windows Vista, Windows 7

Users\username\AppData\Roaming\Postbox

The AppData folder is folder is a hidden folder; to show hidden folders, open a Windows Explorer window and choose "Organize → Folder and Search Options → Folder Options → View (tab) → Show hidden files and folders".

Windows XP

Documents and Settings\<Windows User Name>\Application Data\Postbox

The Application Data folder is a hidden folder on Windows XP. To show hidden folders, open Windows Explorer and choose "Tools → Folder Options → View (tab) → Show hidden files and folders".