As a workgroup, we have set up a shared address book on one of our users, which is synced to .Mac
Each user subscribes to this shared address book; this is visible in Address Book.app as a separate "pile" of addresses.

It seems that Easy Enveloppe will not "reach" these addresses; when I search for one of them, it will not find it. However, if I copy that address to my personal address book, it will find it.

Is this a bug ?

Rup

It's a known issue, but we haven't been able to test it here. It requires at least two .Mac accounts, right?

The Address Book application may have special support for this. Can you access shared addresses in other applications, such as Mail? In other 3rd-party apps?