Rise for 1 day - anywhere you are!

[MultiBear]

See the link a couple posts above, they don't let you mail or trade with a starter account. The only thing extra you can do is join a guild if you already have a >20 in that guild.

Except you don't have to be able to mail or trade: being able to log on those accounts means the heirlooms on hem will get discovered by the new heirloom system and added to the new heirloom tab, that's what Wubsie is referring to. After that, they can be used on all WoW accounts that are part of that Battle.net account.