problem reconstituting outlook database by transferring main identity

Outlook (Office 2011) on my home desktop iMac was corrupted and it no longer displayed emails dating back past this last year.  I copied main identity from my work computer (same outlook account; also iMac) and transferred to my home desktop computer with corrupted file. I changed the main identity to the new transferred file.  Strangely, Outlook now displays a few years of e-mails but still not all of them. My work computer where I transferred the main identity from shows all the files. How can I resurrect the old files on my home computer??