Somewhere in the fall of 2016, an update was released for Outlook 2016 that enabled a mandatory check of the connection endpoint in the Microsoft 365 (Office 365) cloud. Make sure Anonymous Authentication is not selected here.ĭisable Office 365 Autodiscover in Outlook If you have a Microsoft 365 (Office 365) mailbox connected in Outlook, this tab should have an additional field Logon network security.

If you are using GPO administrative templates for MS Office, this setting can be configured with the policy parameter Online Content Options = Do not allow Office to Connect to the Internet under the following GPO section: Administrative Templates -> Microsoft Office 2016 -> Tools | Options | General | Service Options -> Online Content.

Again, you can find more information on Microsoft Learn. As long as you are using ‘in support’ Microsoft Apps, the connection to the online services is supported. You can recognize these ‘versions’ (example) as ‘2301’, which is the January 2023 release. The Office Apps – Microsoft 365 Apps for Enterprise or for Business – do have the modern lifecycle for support, which is roughly 15 months. More information in this Microsoft learn article. And since Microsoft is continuously improving the online service, it also means that over time you might experience malfunction or are not able to use every feature in the online service. You can still connect, but it is not supported by Microsoft. Remarkable: Office 2016 is supposed to be ‘no longer supported’, but Microsoft made an exception end date is – also – October 10, 2023.ĭoes this mean that older Office versions cannot be used with these online services? No. With that, and knowing that for Office 2019, this end-of-support date is October 10, 2023, it might be time to upgrade or migrate.

But only Office applications which are in mainstream support – which is the first five years after the product became available, are supported. The question is, can you use any version of the Office applications to connect to those services?Īctually, you can. Most customers who use those online services, are using the Office Apps, like Outlook, Word or Excel to connect to those services. Microsoft 365 services are the online services which are connected to Microsoft 365 and Office 365 Suite features, such as Exchange Online, SharePoint online and OneDrive for Business.

Outlook 2013 365