Two Quick Questions. Options

[Blackthorne]

Hey guys, got two questions for you.

First off I have Oblivion on the 360, and it's the orginal. Now what I'm wondering is if I decide to get the GOTY edition will my save on the orignal copy be transfered over or will I have to restart the game from the very begining?

Second, During the fighters guild quest "The Noble's Daughter" I took Shadowmere(the horse given to you by Lucien Lachance during the Dark Botherhood quest) into battle with me. When all 3 Orgs were did Shadowmere was with me. As I walked over to The Lady Orc, Shadowmere was gone and when I later fasttracked back to Lord Rugdumps home Shadowmere was also missing. Guess my question is did I loose Shadowmere or is the horse just somewhere out in the wild?