I am very glad Neil reposted the issue here (even though the MSFT response was a bit odd and could have been taken negatively) as that would keep me from deploying PS 2.0 on Exchange 2007. I.E. The post here would hit a wider audience than a random post on the forums.
Also it's a shame MSFT doesn't have a little overlap on RUs for SPs so that people have a few months to test and deploy a new SP before MSFT cuts off RUs for the previous version. Supportting the various SPs is obviously a cost issue from MSFT, but it is also the case from a customers POV.
I am hopeful that if a new ciritical issue arrises on SP1 machines that MSFT would consider releasing another RU for it as they did in the past for the RTM version.