I bought the upgrade to Mac OSX Mainly for the performance upgrades, demands on the computer and hard disk space. Here are the obvious changes (not always upgrades) I noticed so far.

iTunes
When I updated iTunes I noticed that the iTunes welcome screen opened at program start up. No obvious change to the program and everything was as it was.

Mail
I opened Mail and it reconfigured, again everything was as I left it, I’m guessing it’s the improvements to Microsoft Exchange Server that was the main change there.

QuickTime
I must say I almost had a almost had a heart attack when I opened the new Quicktime player, it’s gone all consumer with share instead of export and limited functionality much like when Apple wound the clock back on iMovie. Fortunately I managed to find the legacy player still on the machine Applications > Utilities > Quicktime 7 player with all he old functionality… Few!!

I didn’t check the free Hard Drive space when I did the upgrade but apparently you will get 7 gigs of disc space back. I have noticed speed improvements but the MacBook was pretty quick to begin with although I have not noticed the fan kick in for a while which probably indicates a reduced demand on the hardware.

Oh and the Desktop has changed. Granted this post hasn’t been as in depth as I first envisaged so ask me any questions and I shall test it out for you!