Recently I Installed Drush to windows http://drush.ws/drush_windows_installer, scared that it won't work like it should I tried to update some site so I go to local site directory and try pm-update. I get this message
pm-update needs the following modules installed/enabled to run: update. [error]
The drush command 'pm-update' could not be executed.Thinking, ahhh what now, what UPDATE module does drush need, where do I find this drush update module, is it some kind of submodule etc. This time google is gold and somebody else who asked that
http://drupal.stackexchange.com/questions/76762/drush-pm-update-needs-a…
It is that sites update module that wasn't enabled, so all that was needed was to enable this module and voila, it works, on windows. Cool.