Many issues can arise when upgrading from Exchange Server 2007 to Exchange 2010 since the two must coexist while data is being migrated. During this coexistence time period is where many organizations experience unexpected issues. This expert e-guide from SearchExchange.com explains top issues to watch for during your Exchange Server 2010 migration, including edge transport issues and issues managing distribution groups. And learn why client access server coexistence may not be that terrible, though the disappearance of single instance storage should be cause for concern.