Below are the Exchange related sessions from TechEd North America 2011.

Microsoft Exchange Online in Microsoft Office 365: Migration Case Study
Microsoft Exchange Online in Microsoft Office 365: Simple Migration Live!
Microsoft Exchange Server and Microsoft Office 365: How to Set Up a Hybrid Deployment
Archiving and Discovery in Microsoft Exchange 2010 SP1 and Exchange Online
Best Practices for Successfully Transitioning to Microsoft Exchange 2010
Best Practices for Virtualization of Microsoft Exchange 2010
Load Balancing with Microsoft Exchange Server 2010
Designing Microsoft Exchange 2010 Mailbox High Availability for Failure Domains
Microsoft Exchange Server 2010 Tips and Tricks
Real-World Site Resilience Design in Microsoft Exchange Server 2010
Exchange Server 2010 High Availability Management and Operations
Microsoft Exchange Online: Unified Messaging in Microsoft Office 365
What's New in Microsoft Exchange Server 2010 SP2: Featuring GAL Segmentation

Cheers,