To build large websites

When governments want to gather all their authorities on one website, there are no room for errors. In Canada a lot of errors were made whereas in Australia very few were made. Even though Australia did pretty much the same thing as Canada, but with one important difference. Australia chose to use Drupal while Canada chose Adobe.

You can read more about this on Dries Buytaert's blog: How to move an entire government to a new digital platform