'Windows Live and Hotmail' has now appeared in the 'Internet' section of Download! for most Eseries smartphones and communicators (this was previously Nseries only). The blurb says that Windows Live is currently free but that there may be a charge in the future. Or you could just use Google and GMail instead 8-) (via Eseries)
It must have appeared a while ago on the E90 Downloads - can't say when, exactly, as I don't check on a regular basis - but I've had it for a while (I sat in John Lewis's Place to Eat, using it for IM a couple of weekends ago ... just because I could ;-) ).