Moving from the P drive to SharePoint will cause less downtime 'waiting' for someone to edit the file so you can then edit the file. It has an automated previous versions setup that does not require backup costs and storage costs to be added. SharePoint allows approved individuals to share the file as they see fit removing IT from the equation and allowing a faster information transfer. Files no longer need to be sent via email, instead using a link to the document saving on email inbox size and cutting down the cost of email backups and storage.