Like a Web browser, Postbox lets you view application windows in tabs — enabling you to create an efficient workspaces for everything you’re working on. Open almost anything in a tab, including messages, folders, searches, or content such as attachments and images. You can quickly switch between tabs, or even reorder tabs to customize your view.

By default, Postbox opens messages in a new tab (this setting can also be changed to windows within the Options window). You can open any folder in a new tab by right-clicking the folder, then selecting Open in New Tab from the contextual menu. You can also reorder your tabs by dragging and dropping them to a desired location.

To cycle through tabs using your keyboard, press Ctrl+Tab or Ctrl+Page Down for the next tab, or for the previous tab press Cmd+Shift+Tab or Ctrl+Page Up