A solution for complete Outlook Backup
Outlook, along with other mail programs was poor at complete download of emails. I was told that these email programs are enough to avail me a backup of my emails. But something I noticed was- the emails were deleted from the local cache, the moment I deleted them from my mail account. So they were definitely not the backup I was expecting.
I have bought Mail Backup X now. It works on Windows as well as MacOS. Moreover, the application warns me against all the incomplete emails and assists me at downloading them with full contents.
Needless to say, this application is not affected by deletion from the account.
I got this from: http://www.mailbackupx.com/how-to-scenerios/how-to-backup-outlook-mac-mails-on-mac.html