Importing of MBOX file to Outlook is one of the task if one is unaware about the process for conversion. The MBOX files can be converted to PST files for Outlook manually only if one have a perfect knowledge what and where to code about. If one perform it wrong one may loose his entire data and lead to fully corrupt your files which can not be recovered anyhow. Therefore, to Import MBOX to Outlook 2016 you can use converter tool which are built for performing these jobs well. Mail Passport Lite is an advance converter tool to convert MBOX and EML files to PST files for Outlook 2016 / 2013 / 2011 / 2010 / 2007 / 2003 & Office 365 ( for both Mac and Window). It is a 2 in 1 converter tool and can convert both of them within one go. It can convert any MBOX and EML files to PST and comes with a free trial version which allows you to convert 10 files per folder.
For more details: http://www.mailpassportlite.com