So, I've done some searching, but haven't found any clear answers -

Platform
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iredmail 1.1, downloadable installer
Ubutu 18.04
mysql
free version currently

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I'm most interested in Sogo+ActiveSync, and having a streamlined install is quite nice - this is one of the prime reasons I'm considering iredmail.

However, Sogo doesn't work as I need it to - at least if I haven't missed something...

In short, group calendaring is the most critical function.
And controlling permissions to users is the most challenging.

I can create a user that will "own" the calendar I want to share.
Lets call it, shared-company-calendar.

But now I want to share that calendar with some users - some will have view-only, others can read-write.
[And yes, I know that's not what sogo calls those rights.]

So, the easiest, once you reach any scale, is NOT to grant rights to individual users, but to create groups and grant rights to the group, and then add/remove users from the appropriate groups.

However, I can't see where you can create a group and assign privs to it.

My searches turned up a few things related to sogo groups - but it's not at all clear how they are managed.
Is this something that's configure in the sofo conf file, mysql, or elsewhere?
And can someone give me some specifics - if it's mysql, what tables/fields are we using? If it's a conf file, a rough example would be handy.

I need some framework to start with, please!

TIA
-Greg