During patch days, everyone wants to get updates as soon as possible, and our Technical Support team is here to help you with a special FAQ designed to address any issues which might arise while patching.
They are there for you by phone and email, and you can also access the full support site – which includes general assistance on in-game topics and new content.

FAQ:
http://eu.blizzard.com/support/article.xml?articleId=20110

Technical Support contact details:
http://www.wow-europe.com/en/support/technical.html

Blizzard Support site:
http://eu.blizzard.com/support/index.xml?gameId=11&locale=en