![]() 1000 of Office 2013 (Service Pack 1 with the October 2017 Update, KB 4043461) Starting on 1 November 2021, the following versions are the minimum versions of Outlook for Windows you need to be using to be able to connect to Microsoft 365 services, such as Exchange Online. Please note it is not only Office 2010 in scope – please see the latest update below from Microsoft. If no action is taken the only option is to use the web-based applications such as Outlook Web App () or upgrade to a version listed below. However, your organisation faces an increased cyber security risk and potential compliance issues if this advice is not acted upon before the deadline date. Local O365 tenant impact – Any locally manged Microsoft 365 tenant will not accept connections from Outlook 2010 clients and not send emails to these clients and calendars will not sync.Įxchange On Premise impact – Exchange on Premise systems will allow Outlook 2010 and Office 2010 connections. NHSmail impact – If you are using NHSmail and Outlook 2010 on a device, then you will not be able to connect and all emails from Exchange Online will not be delivered and calendars will not sync. If your organisation has already taken action and deployment numbers are showing a significant reduction you are likely not to be contacted directly by Regional Cyber Security leads. This connectivity will not be extended, the deadline is, and email from Exchange Online to older versions of Office will stop. ![]() In November 2021, the NHS was provided an extended period of connectivity between O365 and older versions of the Office suite to, meaning users may continue to receive O365/Exchange Online email service to Outlook 2010 on their devices.
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