Thanks NR - but it didn't work.
Had Outlook open (always is) on screen - clicked "File" (drop down menu appears), hovered mouse over "Open", box full of "My Documents" appeared. Navigated to desktop>olddrive1>outlook.pst - clicked it - all boxes disappear and Outlook goes direct to "Personal Folders - Outlook Today" page and tells me that I have 59 messages in my (new) Inbox.
For some reason it takes me straight to the new program settings - won't do anything with the old information that I'm trying to import/merge.
Any more thoughts?