check out this confusing spam i got

here it is:
-------------------------------------------
Hello,

My name is Robert Keathley, I represent Parallax Software,
a company that provides software development and IT consulting
services to a large number of businesses worldwide.
I'm sure you've experienced a situation when a software application
you use in your everyday business doesn't fully suit your requirements.
We can help you deal with this. If you are interested in cooperation with
a highly qualified software vendor, please contact me.

PLEASE DO NOT HIT REPLY. Instead please use the address provided below
to contact Parallax Software.

Best regards,
Robert Keathley
Marketing Manager
Parallax Software
[email protected]

P.S. Your contact information was obtained from open sources.
If you think this message reached you by mistake, please send
it back as it is. We will disable your data immediately.
Thank you.
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1. What are they trying to sell me?
2. "I'm sure you've experienced a situation when a software application you use in your everyday business doesn't fully suit your requirements." lol
3. "P.S. Your contact information was obtained from open sources. "

What the fuck is an open source?

-rosey