have you ever consider using Twitter as a notification channel? I know, it sounds crazy, but I can be used in some scenarios (not only for OSD)
You need a notification channel that is easy to access and have a low cost.
Basically we create a System Center Orchestrator Runbook that sends a tweet in the end of the task sequence. There is a list of items you need to make this happen. First you need a Twitter account, I suggest you get a dedicated one and that you “protect” it so you can control the followers. Next you need the Social Media integration pack (download from http://smip.codeplex.com/ and install it on your Orchestrator server) and last you need a Runbook that you can execute in the end of the task sequence.
The Connection to Twitter:
Create a twitter account and run the tool that is included in the integration pack to gain access to Twitter
In Orchestrator, configure a connection:
Add your runbook in the end of the tasksequence
Enjoy the power of the “cloud” :-)