Exchange Center

ENow Software's Exchange blog built by Microsoft MVPs for IT/Sys Admins.

Exchange Announcements

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Michel de Rooij

Yesterday, the Exchange Product made several announcements related to Exchange Server. The overall message throughout these announcements can be interpreted as that Microsoft is publicly declaring to be committed to developing and supporting the Exchange Server product. This is especially of interest to those customers running it as part of their on-premises infrastructure and assuring those that believe the road ahead was a dead end, eventually forcing them to move to Exchange Online, or look for alternatives.

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The Last Exchange Server

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Michel de Rooij

In the announcement that was part of the release of the most recent set of Cumulative Updates for Exchange Server 2019 and 2016, Microsoft introduced some changes – features if you will – which were received with enthusiasm. An overview of these changes was given in a recent ENow blog article: "Exchange Cumulative Updates - April 2022". However, I want take the discussion further and zoom in on one of those features, which also happens to be a popular topic for customers running Exchange Hybrid deployments: The Last Exchange Server.

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Basic Authentication: End of an Era

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Michel de Rooij

Back in September 2019, Microsoft announced it would start to turn off Basic Authentication for non-SMTP protocols in Exchange Online on tenants where the authentication protocol was detected as inactive. This is part of an overall movement to deprecate the less secure Basic Authentication, which is unfit to face the security challenges of the modern world, being subject to things like password spray attacks. It's modern successor, modern authentication or OAuth2, uses a token and claim based mechanism contrary to sending accounts and passwords, and is the preferred authentication method. When combined with Azure AD for authentication, Modern Authentication also supports features such as Multi-Factor Authentication or Conditional Access.

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Microsoft Defender for Cloud Apps

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Nathan O'Bryan MCSM

Formerly known as “Cloud App Security”, Microsoft Defender for Cloud Apps is a Cloud Access Security Broker (CASB) that is part of the Microsoft 365 Defender suite of products. Defender for Cloud Apps (DCA) is built to help IT departments control the data that their organizations have hosted in multiple cloud services including but not limited to Office 365.

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Date Bug in Exchange Causes Headaches

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Jaap Wesselius

Happy New Year! With the recent change to the new year, a nasty bug similar to the Y2K bug (Y2K22?) appeared in Exchange 2016 and Exchange 2019. On 01/01/2022 at 0:00 hour UTC a date conversion failed inside the product, causing the anti-malware agent to fail. As a result, the Exchange transport service was no longer able to process email and mail started to queue on the Exchange server. This also happens on Exchange 2013, but email is not queued and therefore the issue is not directly visible.

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Helpful Ideas for Clearing AutoComplete and Recipient Caches

Clearing AutoComplete and Other Recipient Caches Redux

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Michel de Rooij

Anyone who has participated in migrations or transitions to Exchange is probably familiar or had to work around potential issues caused by the nickname cache. A “cache,” also known by its file extension, NK2 in older Outlook clients, is a convenience feature in Outlook and Outlook on the web (OWA). It lets users pick recipients from a list of frequently-used recipients. This list is displayed when the end user types in the first few letters:

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