Vendors have not only developed groupware designed especially for intranets, but also have modified longtime groupware to accommodate them. Lotus, for example, has made its notoriously proprietary and expensive Notes into something more powerful, more open and less expensive. You can now access Notes apps with a World Wide Web browser. Depending on your infrastructure, platform-independent information sharing and workflow management can be easier than you think. But before you buy or install anything, figure out what you want.
Most government offices have a hodge-podge of platforms.
Think about where the workflow from your office goes. If so, install the same product or find one that will work with it. Study your workflow. You can replicate your processes or take the opportunity to refine them. More communication between workers sometimes makes bottlenecks.