Last year I moved the work intranet from a static web site built with Macromedia Dreamweaver and Microsoft FrontPage and running on a Windows IIS server to Drupal and hosted on a UNIX/Apache server. The intranet consists primarily of documentation, which is fairly static content, and news and event listings, which are constantly updated.
The manual process of adding and archiving news items and preparing the weekly newsletter was a labourious task in the initial static site. Other difficulties encountered with the static site included problems administering permissions (all done via FrontPage) and changing shared items across the intranet. Dreamweaver tended to crash when it attempted to update library items across the entire site and even updating subsets of the site could be very slow.