forced to use GW - Looking for useful resources

I'm forced to use Groupwise - at least for now !

Looking for useful resources like this https://support.office.com/en-gb/article/Create-a-shared-mailbox-871a246d-3acd-4bba-948e-5de8be0544c9

I was told GW was an old mature product and would be able to find tons of resources
but having had a quick look - I can't may good quality / easy to follow resources

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