Here is software that I would like to recommend VartikaTGZ to PST Converter that will help you with an easy and quick conversion of TGZ files to PST.
1. First, Unzip the TGZ file; Select & Right Click on the file & click on Extract Files. 2. Now Launch TGZ to PST Converter on your System. 3. Select conversion option: Single Mailbox & Multiple Mailbox. 4. Next, you can select the mailboxes & start the migration process.