Un bug dans dans la version d'evaluation de communicator 2007 R2 a provoqué une expiration prématuré (180 jours d'evalution) des client. Panique, mais voila la solution et la cause :

This update package fixes the following issues:

The license expiration date for Office Communicator (OC) 2007 R2 Evaluation Edition was calculated incorrectly. This causes OC 2007 R2 Evaluation Edition to expire on June 13, 2009. This update fixes the license expiration date calculation for the OC 2007 R2 Evaluation Edition. By downloading this update, the expiration date will be based correctly on the installation date of the OC 2007 R2.

Read more here:
http://support.microsoft.com/?kbid=972042

Get it here:
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=515d6dba-4c6a-48bb-a06a-d99c5742676d

Je vais faire part d'un problème que je viens d'avoir suite a une mise a jour effectué sur mon front end OCS R2 qui empeche le service de demarré :

Source: OCS AppDomain Host Process, ID: 50007

An unhandled exception was encountered.

Exception Details. System.NullReferenceException: Object reference not set to an instance of an object.
2 Microsoft.Rtc.Server.McuFactory.McuFactoryHost.Main(String[] args)
2 Microsoft.Rtc.Server.McuFactory.ExecutableEntryPoint.Main(String[] args)
2 System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
2 System.AppDomain.ExecuteAssemblyByName(String assemblyName, Evidence assemblySecurity, String[] args)
2 Microsoft.Rtc.AppDomainHost.Launcher.AppDomainLauncher.RunThread()
2 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
2 System.Threading.ThreadHelper.ThreadStart()
Cause: One of the applications identified in the eventlog description failed.

Resolution:

Restart the server. If the problem persists contact product support.

Pour résoudre ce problème :

1. Uninstall all Frameworks on server.
2. Download and install a last version of Framework (3.5 SP1) from Microsoft site.
3. Download and install NDP20SP2-KB958481-x64.exe, NDP30SP2-KB958483-x64.exe, NDP35SP1-KB958484-x64.exe updates.
4. After that Windows update installs to updates to Communication Server (April and some for Monitoring Server, before that it don't want to install April updates).
5. Reboot server, services started.