I posted a blog earlier this year on running OCS 2007 on XenApp. Since that time, I've received many emails from customers telling me they've started rolling out OCS 2007 via XenApp in either pilot or production environments. Most of these customers are running IM and Presence with integration into office apps. For those who are still not sure about delivering OCS 2007 via XenApp, I have good news. Citrix Consulting Solutions team has documented a best practice guide detailing how to you can deliver Office Communicator with XenApp 4.5. Come download the Microsoft Office Communications Server 2007 Application Delivery Best Practices guide at: http://support.citrix.com/article/ctx118216