Exchange 2010 and a New Job

Today I was offered a new job for a managed service provider and I the first thing i'm going to have to do is get up to speed on Exchange 2010. I don't have much experience with exchange so i was wondering what is the best book for the 70-662 exam?
Current Certification Exam: ???
Future Certifications: CCNP Route Switch, CCNA Datacenter, random vendor training.
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