Are you planning on implementing SharePoint for collaboration or enterprise search, or do you already use its workflow or records management features? Successfully consolidating, migrating and managing files within SharePoint leads to more productive staff through efficient collaboration using automated process, version control and alerts.
Without carefully considered planning, migrating files from an ageing disorganised repository into SharePoint (or other ECM) can merely result in the transfer of poorly governed content into a more expensive location. To best realise the benefits which ECM can deliver, you should only populate it with information which has value to the business, and ensure the migrated files are suitably tagged with useful metadata.