Thanks for getting back so quickly and with a positive (for me) answer. I've
paged back through all the articles I was reviewing on this and you're
right - the Ex Ent option was just a comment from someone about being able
to handle 8 Terrabytes
on their server - best of luck to them!
Since posting I have read another article which suggests that I should
update the SBS server to SP1 in order to get all the benefits of Ex SP2.
Reading the rel notes on SBS SP1 I can see a lot of time passing before I
actually get Exchange going again. If you were in this position, would you
go for a full server update first??