Q:

Does biztalk have Service Packs? Or just Cumulative updates?

Does biztalk have Service Packs? Or just Cumulative updates?
I am unable to see any service packs after 2009

A:

BizTalk only has cumulative updates, they do not have concept of Service Packs, I believe they changed the model somewhere in 2006. You should look for latest cumulative updates.
Here is the full list
http://support.microsoft.com/kb/2555976

