AFTERPAD

To move the PST emails to your Google Workspace, you need to first convert the PST file to MBOX using a respected PST converter tool. After that, import the MBOX file to Thunderbird by adding your Google Workspace account to Thunderbird with IMAP. Your emails will be automatically synced to your Google Workspace inbox. This procedure is easy and safe and would be best suited with an effective product such as the BLR Tools PST email data converter tool.

Try this: https://www.blrtools.com/pst-exporter-tool.html