Out of Office Service with clients and templates less than 8

I would like to change the Out of Office functionality from Agent to Service. From what I have read all Domino Servers should be 8 or higher. What about Notes Clients? We currently have users who are running a 6.5.5 Client with a 6.5 mail template on Citrix. We currently are not planning on upgrading their clients to 8.5.1. Will the Out of Office as a service still work for these users?

Subject: Solved: See URL

http://www-10.lotus.com/ldd/dominowiki.nsf/dx/01072009040728PMWEBSS8.htm

It appears you can still run the OOS with mixed Client environments. Clients that are < 8.x will run as an agent while those > 8.x will run as a service.