Microsoft have released a number of updates specifically for SBS 2011 Essentials today. These updates fix specific issues that have been seen out there in the field by end users and resellers.
The first one here is Update Rollup 1 for SBS 2011 Essentials and includes fixes for 8 issues including migration issues, RWA domain name issues, Alerting issues, and some international character issues. It’s a must have fix for your SBS 2011 Essentials server. Whilst these are server side patches, you must also install an additional patch on the client side for all connected clients. It’s available here
The second patch here deals with further migration issues that occur due to one of the default group membership settings not being set correctly.