Gmail is now used all over the globe, not sure about astronauts. Recently, importing Outlook PST files to Gmail has become a trend, and many Outlook users are seeking an automated tool for this.
Several vendors on the internet provide an automated solution for this, but I trust and use
Shoviv Gmail Backup tool. It is very simple using it is the same as using a desktop application, you can navigate everything from the dashboard. The tool offers several features that make it a reliable solution for businesspersons to import Outlook PST file to Gmail mailboxes.
1. You can import multiple PST files into Gmail mailboxes without any hassle.
2. There is no bar on adding PST file size. Hence you can add PST files up to the maximum possible size.
3. You can filter out unwanted emails by using the filter option. The filter option is on the date filter and folder filter-based criteria.
You are enabled to check software skills before purchasing by using the free version.
For more info -
Import PST to Gmail