Can part of a large site with tens of millions of page views per month be moved over to Drupal while leaving the remainder as static web pages? It would be done on a "subsite" (folder by folder) basis.
Are there any technical hurdles to overcome with using the same domain running some "subsites" on Drupal hosted externally, while keeping the rest on an in house web server? Would subdomains help?
Are there specific issues with doing this on Pantheon or Acquia that I should be aware of?