Gmail offers a dedicated import tool for mail and contacts, but it cannot import the other data included in a PST file, like calendar appointments.

Looking to use Google contacts in Excel? You'll need do some exporting and importing then. Don't worry, the process is easier than you think.

If you've encountered a CSV file and you're unsure what they're for, the good news is they're pretty straightforward and easy-to-use with apps you already know.