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The Hafnium and other attacks happened against on-premises Exchange servers exposed to the internet, but it’s a wonder why the proverbial penny didn’t fall for tenant administrators to prompt them to query the wisdom of permitting the use of old client technology.
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Given the publicity about attacks against Exchange Server earlier this year, it’s remarkable that organizations allow such old client software to remain in active use.
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They say that Microsoft customer support teams will reach out to customers still using the old versions to “ help them meet the deadline.” Maybe that’s code for “sell new versions of Outlook.”įigure 1: Outlook 2007 (source: Microsoft) Time to Move to More Secure Protocols Interestingly, Microsoft notes that “ some customers just can’t quit” using Outlook 2007 (Figure 1), Outlook 2010, and earlier versions of Outlook 2013. In this case, if people are using Outlook for Windows clients older than Outlook 2013 Service Pack 1 (complete with the latest fixes), they won’t be able to connect to their Exchange Online mailboxes after November 1. As Microsoft notes, “ we are quickly approaching the November 1 deadline…” Time can move slowly when replacing old client versions in IT infrastructures and Outlook is no different. Outlook’s November 1 DeadlineĪll of which brings me to the news that November 1 is the drop-dead date for connectivity for some older Outlook versions. This task is harder than it seems because announcements are spread across the message center in the Microsoft 365 admin center, blog posts issued by individual development groups, plus some corporate news posts.
In a nutshell, you need to keep an eye on Microsoft announcements and updates to know when things will happen.
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This is a Microsoft Office 2003 critical update that was released on November 4, 2003. The original release version of Outlook 2003 was released in October of 2003.
Outlook 2003 version information Outlook 2003 version
This is the original RTM release of Outlook 2007. Outlook 2007 version information Outlook 2007 version This is the original RTM release of Outlook 2010. Outlook 2010 version information Outlook 2010 version This is the original RTM release of Outlook 2013. Outlook 2013 version information Outlook 2013 version The following information lists the version information and the build numbers for the U.S.
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How to determine Outlook version information