>The first one looks like it is missing SP1.

On that server, only SSMS is installed for 2008. The engine is not there. So, it would then be possible to install SSMS for 2008 from a DVD for R2 without having installed the DVD for SP1. Is that correct? But, if that is the case, does this mean, on that server which has no engine, that we would have to insert the DVD for SP1 just to install SSMS and then do the same procedure again from the DVD for R2?

I would then assume SP1 would have been missing from all the other installations where SQL Server 2008 R2 was installed. This is something I will have to check this morning.