We're having a lot of issues with pages (especially re-uploaded images) not being displayed properly on end-user workstations because the local browser is caching the pages even though they have been updated. Obviously manually clearing the cache (globally or with CTRL-F5) fixes the problem), but this simply doesn't scale well to end users.
We're running MediaWiki on MS IIS 6.0 (Windows 2003) and all users are using IE 6 to view the site.
Has anyone had experience fixing these types of issues?