New answers tagged outlook
Add the site to local intranet zone on a pc and see if the window is still coming - i assume your gpo does not work
Go to Site Setting Web Design Galleries > Web parts Files New Document> New Select: "Microsoft.SharePoint.Portal.WebControls.OWAInboxPart"
It is not possible to use Outlook distribution list as a SharePoint security group. However you can convert the Outlook distribution list to an Active Directory Security group. Next you can import the Active Directory security group to SharePoint.
No this is not possible, you can use AD Users and AD Groups if you do not use a custom Claims-provider
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