How to integrate with SharePoint

There are numerous options to how to integrate your LOB systems with SharePoint. The answer tends to depend on who you ask, as SharePoint experts will tell yo to use BCS, Microsoft oriented consultants might recommend WCF /AppFabric and SAP consultants will tell you to go with Duet. The right approach depends of course on the actual business requirements. In this article I I will try to summarize the different approaches and highlight their pros and cons.