Hi, follow the next process to import converted PST file into Windows Outlook 2013.
Here is the step by step process:
1. Sign in to MS Outlook 2013.
2. Go to File → Open & Export → Import/Export.

3. Select Import from another program or file option. Click on Next button.

4. Click on Browse button to open converted PST file.

5. In next wizard click on Finish button to finalize the conversion process.

These are the steps to convert Maildir to Outlook.
Thanks