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Is it possible to change an e-mailadres of a guest in Groups
Can a group-owner change the e-mail address of a guest, when the guest has a new e-mailadress?
Nope. What you can do is remove the Guest user and add him with the new address.
Oh sorry, I'm not the tenant owner! I can not use; Exchange cmdlets
Is it possible in the group in Usermanagement, where I can also add users/guests?
Nope. What you can do is remove the Guest user and add him with the new address.