You should probably read up on the Unity website what features Unity free has and what it doesn’t have… Unity free does not include any post effects. Shadows in Unity free are a brand new thing, a few months ago, there never were any shadows in Unity free. Unity free only has hard shadows now, there are no ‘soft’ shadows. There is in pro however.
It also looks like you have you shadow resolution set really low. As well, remember you are viewing on solid white surfaces where flaws show the most.
Eidt: I see by the screenshot you just posted that you have your shadow resolution set to very high. However you may want to check your actual light source, cause it may be set to a lower quality independently.
Annoyingly, shadows and multisampling don’t work properly together.
It looks like Unity uses a screen-space buffer within the shadow system, which isn’t really compatible with multisampling. As a result, you can get some nasty looking polygon edges when using multisampling and strong directional shadows.
The only solution really seems to be to use Unity Pro and postprocessed antialiasing (but IMHO, it’s not as nice looking as multisampling)