While the article tells you to run Outlook to find where your files are, you can find it the old fashioned way. So your data is likely just fine and you will need the CD from time to time when major updates happen. There is nothing really new going on here.

If for some reason you lost the CD there are ways to order it and then we have other email apps like Thunderbird that can import the PST data.

-> Windows has never been an OS you can count on to safeguard your apps and data. Maybe this is news to some but no seasoned PC user would be with backups of what they can't lose.