I do have the 6.5.6 update 1 client on the BES, so that bit is ok.
Vodafone are saying that i need 6.5.5 on my groupwise servers. i have 6.5.4 on all of them and it would be a bit of a political issue applying sp5 as we are looking at rolling out Groupwise 7 soon. We have many sites all over the country who look after their own domains (i am central 3rd line support). Rumours of us being forced to move to Exchange does not help matters