How to safely recover mac Outlook 2011 database?

There are plenty of tools that offer safe and fast email migration, but unfortunately, the number of tools that offer email database recovery is not much. Mac email users had only OLM file recovery method to recover their Mac Outlook 2011 email database, but it is also risky and slow.
http://outlookmacdatabaserecovery.blogspot.in/2016/12/an-ultimate-solution-guide-to-recover.html