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Older versions of Outlook no longer to be supported in Microsoft 365 by November

Microsoft is pushing customers to move to newer versions of Outlook before November 2021

Microsoft have been informing business customers using older versions of Outlook to upgrade to newer software before the 1st November 2021. After this date, only Outlook 2013 Service Pack 1 (with the most up-to-date patches) and later versions will be able to connect to Microsoft 365 Exchange.

It also needs pointing out that Outlook 2007, 2010, and Office 2013 versions earlier than version 15.0.4971.1000 are no longer supported now.

Although the 1st November deadline has been publicised for a few months, Microsoft now wants to ensure customers move to a newer version of Outlook in time before the deadline and to prevent any work disruption.

Microsoft have stated that it has seen a steadly and constant decline in the use of old Outlooks versions since its initial announcement of the change last year which is a good sign that most customers have already upgraded to newer versions of Outlook.

So why the push to using newer versions of Outlook?

Microsoft wants to move away from the basic authentication systems used in older versions of Outlook and instead ensure everyone connecting to its Microsoft 365 services use more modern and secure protocols. This will also prevent cyber security problems from external threats so it does make sense.

Plus with it’s 365 business plans (Standard and Premium) that already include the Microsoft suite of apps to download to Macs and Windows PCs, there is no cost to upgrade to newer versions of Outlook.

Microsoft is also working on adding HTTP/2 connections in Microsoft 365 which is only supported in the latest Outlook clients.

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