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Holly,

What I want is what I have on Yahoo: a publicly listed group with
members having access to ... old messages ... but people who are not
group members cannot view the ... old messages,

Under Visibility choose "Group listed in directory, private messages". That's in the Privacy section of your group's Settings page.

Note that you'll be warned that once you make your messages private you cannot later make them public again. That is true with Yahoo Groups as well.

but people who are not group members cannot view the files (photos,
text files, etc).

The access controls for other areas of your group are further down the Settings page, in the Features section. Of those only the Wiki and the Calendar can be given public (non-member) read-only access. Chats, Database, Files, and Photos cannot be made available to non-members.

Is this considered "private" or "public"? I would have thought it
would be private, but the wording is ambiguous - a publicly listed
group with public archives might mean either that non-members can see
the archives or that archives are available only to members.

I don't see how that's ambiguous, but in any case the wording there has recently been changed, replacing "archives" with "messages" for greater clarity on the scope of the control.

Shal


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