Reliability is key--a website is only as good as its uptime. You need a site management platform that integrates with your existing systems like Windows SharePoint and Active Directory, and scales to meet future multi-site or cloud based deployments.
The architecture of Sitecore allows you to tackle major deployments with minimal downtime. The separation of authoring and delivery instances allow us to perform these migrations in steps. It is important to remember that publishing content changes in Sitecore is easy and 100% a content manager task. This article covers large code changes to the site not just content changes.
Security and Authentication is in line with other .NET applications. We offer Active Directory Integration and support the standard Microsoft security providers.
An introduction to the Sitecore workflow engine. This article walks through the Sample Workflow that ships with Sitecore.