Welcome to the Q&A Forum

Example: A page has 100 links, 90 internal links and 10 external links. The page has a Google internal PR of 1000. The question is: Is the pagerank that flows to the internal links being calculated taking into account all links on the page (internal + external) or only the 90 internal links? E.g. is the PR that flows to the internal links 1000/100 or 1000/90? Are links to external sites "votes" that do not affect the internal PR flow? Disclaimer: I understand that the maths behind the PR algo are more complex. This simplified example only serves to explain my question.

What is your take on site wide inernal links in the footer, e.g. for the most competitive keywords? Do you think those links are still useful or are those links of little value from your experience? It is an old school tactic but I still see many sites doing it.