Windows Server 2012 Essentials Update Rollup 1 has been released today and is available for download from Microsoft Update. You can read about the issues this rollup update addresses in Microsoft Support Knowledgebase 2781267.
In addition to the server-side update, a client-side update has been released as well. This update is documented in KB 2781268. The client-side package will be downloaded to the server along with the Update rollup. User does not have to go to the Windows Update website to obtain the package separately for the client machine.
If you have Office 365 Integration feature enabled before installing Update Rollup 1 for Windows Server 2012 Essentials (KB2781267), after you apply UR1 and reboot the server, you may get below Health Alert when opening the dashboard:
One or more service are not running
The following important Windows services are not running. Windows Server Office 365 Integration Service (O365ProviderSvc) Note: Services can be stopped when software update are applied.
Run the following commands in an elevated PowerShell window and restart Windows Server 2012 Essentials Dashboard.
Set-Service -Name PwdSyncProviderSvc -StartupType Automatic
Set-Service -Name PwdSyncProviderSvc -Status Running
Set-Service -Name O365ProviderSvc -Status Running
For more information, visit this wiki.