Update unity can't find old projects

Hi, Just a few minutes ago I updated unity for the first time from 2.6.x to 3.3 and after entering my serial number for my license, I opened unity and my old projects were not there. My projects are still on my computer however they do not show up in unity. Does anyone know why this is happening?

If you have any questions, feel free to ask them.

Thanks

What Joshua said on the comment (see comment below question).