Did you purchase Lightroom 3 after February 6th?

If you purchased Lightroom 3 after February 6th then you should be eligible for a free upgrade to Lightroom 4.
Here are the steps as they were explained to one of our members from Adobe. LR3 purchases after Feb 6, 2012 are eligible. The best bet would be to call Adobe's sales support number (800) 585-07741)
1) login to Adobe.COM with your Adobe ID and password
2) open a support case requesting a free upgrade
3) in the case description, mention that LR3 was purchased after Feb 6, 2012
4) include your LR3 serial number
5) attached the receipt to the case (scan it if you don't have an electronic copy)
6) Adobe will contact you about how to get your free upgrade.Here are two links that might be of some help:
1) http://slickdeals.net/f/4032582-FREE-Adobe-Lightroom-4-Upgrade-if-you-purchased-LR-3-recently