A: You have documents stored everywhere, don't you? File servers, network attached storage, storage area networks (SANs) — these are some of the storage devices that maintain the whole document corpus of your organization. But what happens to all of these documents when you make the eventual move to SharePoint? End users will definitely want to use the Enterprise Search capability of SharePoint to find documents, regardless of where they are located in the enterprise. You are also going to move a good portion of documents and records into SharePoint (it is an enterprise content management system after all).

While it is the duty of your IT department to sort out the technical specifics, you should understand the basics of SharePoint capacity planning, especially in terms of storage. This will give you a better idea of what storage is going to cost you. Each of the deployment types (on-premise...