When importing from an old Lightroom 2 catalog into Lightroom 4 (also from Windows to Mac) I seem to have lost all the development history of my photos. Is there any way to retain that?

Question

I finally managed to get through the process of moving files and catalog from Lightroom 2.7 on a PC to Lightroom 4 on my Mac.  I think I did it all correctly and all my file and previews and some tagging seems to be there.  Two things are lost
1 - Most importantly, the development history on my files.  I can see the edited versions in the previews, but as soon as I click on it, I can see that I lose all the changes I had made before.  When I look at Development history, it just says "Imported on...."  I'd love to get this back.  That is a ton of processing work just lost because I switched computers.
2 -  The collection names seem to have come over, but they are all empty.  This is also a lot of work lost, though not as important as #1
Is there any recourse?

Answer 1

For iTunes Help
Add artwork to songs and other items
Music and video you buy from the iTunes Store comes with its own artwork. You can add your own artwork to songs and other items in your library.
You can add many popular types of still image files, including JPEG, PNG, GIF, TIFF, and Photoshop. You must convert WAV files to another format before you can add artwork to them.
Album artwork for the currently playing item appears to the left of the progress bar. To view album artwork at a larger size in a separate window, click the artwork.
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Add artwork to music and video
Do any of the following:
Add artwork to one item at a time:
Select an item in your iTunes library and choose File > Get Info.
Click Artwork and do one of the following:
Click Add, select an image file, and click Open.
Drag the art file to the artwork area.
To add artwork to another item, click Next or Previous.
Add the same artwork to multiple items: Select the items, choose File > Get Info, click Info, and drag an image file to the Artwork area.
Retrieve album artwork for songs in your library from the iTunes Store: Control-click the songs and choose Get Album Artwork from the pop-up menu.