Many people are uncomfortable in using other email client application. So their first preference is MS Outlook. It has a lot of features which are not found in other application. The graphical user interface of MS Outlook is the best amongst all email suites.
The problem appears when the Outlook shows an error. Some people use MS Outlook on Windows operating system and uses it on the Mac operating system. Sometimes due to the corruption of files, the MS Outlook shows an error in the opening on Mac. This can only be resolved by repairing the Mac Outlook Files.
So I found a blog which has the various methods to fix the Mac Outlook errors. There are some free techniques in this article which can help you to resolve the issue. You can apply these techniques by yourself. They are explained in detail so that it can clear all your doubts.
But still, you are unable to fix the error then you can go for a third party tool which will definitely fix the Outlook problem for mac. The tool is very easy to use and anyone can use it. These tools have a user-friendly interface which causes no issues in running the tool.
Adviser for Technical issues 