I had developed a simple workflow in Sharepoint Designer 2010. I got this error when I tried to publish the workflow into my MOSS 2010 site.
“Activation could not be completed because the InfoPath Forms Services support feature is not present.”
I got a good hint from the blog http://bphillips76.spaces.live.com/blog/cns!F9B548E4C21D6166!371.entry . Due to some configuration issues, I was getting error whenever I clicked “Site collection features” available below “Site Collection Administration” in the Central administration site. Hence, I used the following powershell commands to get rid of the exception i.e “Activation could not be completed because the InfoPath Forms Services support feature is not present.” Open your powershell management console and type the following commands.
This got rid of the exception.