The spell checker is another feature which unfortunately does not work in Firefox or Thunderbird at the time of writing. It can automatically expand abbreviations in some programs and append a signature with a random quote as well. Phrase Express offers several other features that make it a great software. The second method is of course a lot faster than the first. You may then paste those phrases by either right-clicking the system tray icon and selecting the phrase from the menu or by assigning hotkeys to folders or single phrases. You can for instance create folders for business, private and forums and add as many phrases as you want to those folders.
It is possible to create a folder and text structure that works best for you. The program adds some of its own at the beginning but the real beauty is the flexibility of it. You can use Phrase Express to paste commonly used phrases into any text field easily. While you can sometimes use built-in automation, for instance for email signatures, you may want to use the program if you need a versatile option, for instance if you need to switch between multiple signatures regularly or different programs that you use.