Step back and think: How would you answer the question, “What does your IT group deliver to your business?” Your answer will indicate how you think about the relationship between business and technology, and, in turn, it will affect your business agility and your business-IT alignment.
If you answer anything close to “IT delivers and integrates solutions to meet business requirements,” your mental model boils down to thinking that your solutions support the business: Business is one thing; solutions are a separate thing. If the business has a problem, let it come ask IT for some application to address the problem — maybe IT will even help the business figure out what it needs. Each application supports (typically overlapping) parts of the business, and IT performs whatever behind-the-scenes integration is necessary to gain some degree of coherency across the whole. The result is the sort of siloed spaghetti application mess that most organizations are dealing with — even if SOA and BPM and the rest make it easier to deal with.