Dear Justin,
There are multiple ways by which you can export Mac Outlook data to Apple Mail.
1. Via Manual Solution
2. Via SysTools OLM File Converter
The manual solution is little bit complex but will help surely.
First of all you need to configure your company email account (IMAP) in Mac Outlook and them sync all data with your company mail server. Now configure the same email account in Apple Mail.
The manual solution is somewhat lengthy and requires complex operation to accomplished. So, it is recommended to go with SysTools OLM File Converter for Mac. It will gives you result in MBOX file format which can be easily imported into Apple Mail using Import option.
I hope this will end up your problem.