Microsoft has announced itself in the enterprise search market by introducing Microsoft Search Server Express 2008. It can be downloaded via the release candidate. MS says the product is free today, and it will be continue to be free at the time of general release in the first quarter of 2008.

Search Server Express should comfortably index and search 400,000-500,000 documents on a reasonably sized server, and capacity and performance can be scaled in a multi-server deployment using the licensed version of Search Server 2008. Further, the Search Engine has also wide variety of connectors for searching MS and Lotus libraries.

MS has also published a Microsoft’s enterprise search products comparison table. Check out here.