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	<title>Jaap Wesselius</title>
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	<item>
		<title>Upgrade Entra Connect Sync to Entra Cloud Sync</title>
		<link>https://jaapwesselius.com/2025/08/27/upgrade-entra-connect-sync-to-entra-cloud-sync/</link>
					<comments>https://jaapwesselius.com/2025/08/27/upgrade-entra-connect-sync-to-entra-cloud-sync/#respond</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Wed, 27 Aug 2025 20:01:27 +0000</pubDate>
				<category><![CDATA[Azure AD]]></category>
		<category><![CDATA[Office365]]></category>
		<category><![CDATA[Active Directory]]></category>
		<category><![CDATA[Azure]]></category>
		<category><![CDATA[Cloud Sync]]></category>
		<category><![CDATA[Directory Synchronization]]></category>
		<category><![CDATA[Entra Cloud Sync]]></category>
		<category><![CDATA[Entra Connect Sync]]></category>
		<category><![CDATA[Entra ID]]></category>
		<category><![CDATA[PowerShell]]></category>
		<category><![CDATA[Security]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=7652</guid>

					<description><![CDATA[Microsoft is offering two directory synchronization solutions for synchronizing identities from Active Directory to Entra ID: The first one is available since the beginning of directory synchronization (with different names over the years), Cloud Sync was introduced in January 2019 as the successor of the Entra Connect server. With the introduction of Cloud-Managed Remote Mailboxes, &#8230; <a href="https://jaapwesselius.com/2025/08/27/upgrade-entra-connect-sync-to-entra-cloud-sync/" class="more-link">Continue reading <span class="screen-reader-text">Upgrade Entra Connect Sync to Entra Cloud Sync</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
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		<post-id xmlns="com-wordpress:feed-additions:1">7652</post-id>
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		<item>
		<title>The last Exchange server in the organization</title>
		<link>https://jaapwesselius.com/2025/08/25/the-last-exchange-server-in-the-organization/</link>
					<comments>https://jaapwesselius.com/2025/08/25/the-last-exchange-server-in-the-organization/#comments</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Mon, 25 Aug 2025 06:36:00 +0000</pubDate>
				<category><![CDATA[Azure AD]]></category>
		<category><![CDATA[Exchange Hybrid]]></category>
		<category><![CDATA[PowerShell]]></category>
		<category><![CDATA[Directory Synchronization]]></category>
		<category><![CDATA[EntraID Connect]]></category>
		<category><![CDATA[IsExchangeCloudManaged]]></category>
		<category><![CDATA[Last Exchange Server]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=7632</guid>

					<description><![CDATA[Many organizations struggle with that Last Exchange Server (LES) in the organization. All their mailboxes are in Exchange Online, but an on-premises Exchange server is still needed for managing the mailboxes in Exchange Online since the Source of Authority (SOA) is still the local Active Directory. On August 21, 2025 Microsoft announced the Cloud-managed remote &#8230; <a href="https://jaapwesselius.com/2025/08/25/the-last-exchange-server-in-the-organization/" class="more-link">Continue reading <span class="screen-reader-text">The last Exchange server in the organization</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
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			<slash:comments>5</slash:comments>
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">7632</post-id>
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		<item>
		<title>Upgrade Entra Connect Sync to version 2.5.76.0</title>
		<link>https://jaapwesselius.com/2025/08/22/upgrade-entra-connect-sync-to-version-2-5-76-0/</link>
					<comments>https://jaapwesselius.com/2025/08/22/upgrade-entra-connect-sync-to-version-2-5-76-0/#respond</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Fri, 22 Aug 2025 14:03:59 +0000</pubDate>
				<category><![CDATA[Azure AD]]></category>
		<category><![CDATA[Directory Synchronization]]></category>
		<category><![CDATA[EntraID]]></category>
		<category><![CDATA[EntraID Connect]]></category>
		<category><![CDATA[Upgrade]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=7623</guid>

					<description><![CDATA[Minor versions of Entra Connect Sync are (mostly) installed automatically. Major upgrades need to be installed manually, so after downloading the latest version from the Microsoft download center. When trying to download Entra Connect Sync version 2.5.3.0 the only thing that was downloaded was the DecommissionDownloadCentre.pdf file, and it stated the following: Important Update: New &#8230; <a href="https://jaapwesselius.com/2025/08/22/upgrade-entra-connect-sync-to-version-2-5-76-0/" class="more-link">Continue reading <span class="screen-reader-text">Upgrade Entra Connect Sync to version 2.5.76.0</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>https://jaapwesselius.com/2025/08/22/upgrade-entra-connect-sync-to-version-2-5-76-0/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">7623</post-id>
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	</item>
		<item>
		<title>Exchange Server Subscription Edition (SE) publicly available</title>
		<link>https://jaapwesselius.com/2025/07/01/exchange-server-subscription-edition-se-publicly-available/</link>
					<comments>https://jaapwesselius.com/2025/07/01/exchange-server-subscription-edition-se-publicly-available/#respond</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Tue, 01 Jul 2025 20:23:10 +0000</pubDate>
				<category><![CDATA[Exchange]]></category>
		<category><![CDATA[exchange server]]></category>
		<category><![CDATA[Exchange Server SE]]></category>
		<category><![CDATA[Perpetual License]]></category>
		<category><![CDATA[Subscription Edition]]></category>
		<category><![CDATA[Upgrade]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=7034</guid>

					<description><![CDATA[Today, July 1st, 2025, Microsoft released Exchange Server Subscription Edition (SE) as the successor of Exchange Server 2019. Exchange Server SE in itself is not that exciting, it is 100% binary compatible with Exchange 2019 CU15 with the latest May 2025 Hotfix Update, except for the license agreement (EULA) and the build and version number. &#8230; <a href="https://jaapwesselius.com/2025/07/01/exchange-server-subscription-edition-se-publicly-available/" class="more-link">Continue reading <span class="screen-reader-text">Exchange Server Subscription Edition (SE) publicly available</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>https://jaapwesselius.com/2025/07/01/exchange-server-subscription-edition-se-publicly-available/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">7034</post-id>
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		<title>Exchange Hybrid strange calendar behavior and mail flow</title>
		<link>https://jaapwesselius.com/2025/03/12/exchange-hybrid-strange-calendar-behavior-and-mail-flow/</link>
					<comments>https://jaapwesselius.com/2025/03/12/exchange-hybrid-strange-calendar-behavior-and-mail-flow/#respond</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Wed, 12 Mar 2025 13:02:16 +0000</pubDate>
				<category><![CDATA[Exchange]]></category>
		<category><![CDATA[Exchange Hybrid]]></category>
		<category><![CDATA[Azure]]></category>
		<category><![CDATA[Azure AD Connect]]></category>
		<category><![CDATA[Cloud]]></category>
		<category><![CDATA[Directory Synchronization]]></category>
		<category><![CDATA[Entra Connect Sync]]></category>
		<category><![CDATA[Entra ID]]></category>
		<category><![CDATA[Exchange On-premises]]></category>
		<category><![CDATA[Mail-enabled user]]></category>
		<category><![CDATA[Mailbox]]></category>
		<category><![CDATA[Microsoft]]></category>
		<category><![CDATA[Security]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=6837</guid>

					<description><![CDATA[In a hybrid Exchange environment, mail flow is erratic, meetings are not always visible, and the Teams calendar does not match the calendar in Outlook. The user sends an email, and all recipients receive it. However, the sender does not always receive replies, sometimes resulting in a Non-Delivery Report (NDR). Another issue is that external &#8230; <a href="https://jaapwesselius.com/2025/03/12/exchange-hybrid-strange-calendar-behavior-and-mail-flow/" class="more-link">Continue reading <span class="screen-reader-text">Exchange Hybrid strange calendar behavior and mail flow</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>https://jaapwesselius.com/2025/03/12/exchange-hybrid-strange-calendar-behavior-and-mail-flow/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">6837</post-id>
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	</item>
		<item>
		<title>Exchange 2019 Cumulative Update15</title>
		<link>https://jaapwesselius.com/2025/02/11/exchange-2019-cumulative-update15/</link>
					<comments>https://jaapwesselius.com/2025/02/11/exchange-2019-cumulative-update15/#comments</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Tue, 11 Feb 2025 07:53:59 +0000</pubDate>
				<category><![CDATA[Exchange]]></category>
		<category><![CDATA[CU15]]></category>
		<category><![CDATA[ECC Certificates]]></category>
		<category><![CDATA[Exchange 2013]]></category>
		<category><![CDATA[Exchange 2019]]></category>
		<category><![CDATA[exchange-server-se]]></category>
		<category><![CDATA[Feature Flightin]]></category>
		<category><![CDATA[Security]]></category>
		<category><![CDATA[TLS 1.3]]></category>
		<category><![CDATA[Windows 2025]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=6797</guid>

					<description><![CDATA[On February 10, 2025, Microsoft released Cumulative Update 15 for Exchange 2019, also called the 2025H1 Update, the first step towards Exchange Server SE. CU15 is an interesting and essential update since it is the last major update for Exchange 2019. The next major update that Microsoft will release is Exchange Server Subscription Edition (SE) &#8230; <a href="https://jaapwesselius.com/2025/02/11/exchange-2019-cumulative-update15/" class="more-link">Continue reading <span class="screen-reader-text">Exchange 2019 Cumulative Update15</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
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			<slash:comments>2</slash:comments>
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">6797</post-id>
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	</item>
		<item>
		<title>Exchange 2019 CU14 on Windows 2025</title>
		<link>https://jaapwesselius.com/2025/02/03/exchange-2019-cu14-on-windows-2025/</link>
					<comments>https://jaapwesselius.com/2025/02/03/exchange-2019-cu14-on-windows-2025/#respond</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Mon, 03 Feb 2025 12:41:29 +0000</pubDate>
				<category><![CDATA[Exchange]]></category>
		<category><![CDATA[Cloud]]></category>
		<category><![CDATA[Exchange 2019]]></category>
		<category><![CDATA[Microsoft]]></category>
		<category><![CDATA[Prerequisite software]]></category>
		<category><![CDATA[Security]]></category>
		<category><![CDATA[SMTP Stack]]></category>
		<category><![CDATA[Windows 2025]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=6817</guid>

					<description><![CDATA[Last Friday, Microsoft released a blog post announcing a delay in the upcoming Exchange 2019 CU15, also known as Exchange 2019 H1 2025 CU. This blog post also mentions support for Exchange 2019 CU14 running on Windows 2025, including Windows 2025 Domain Controllers. This can be very interesting if you are planning to move to &#8230; <a href="https://jaapwesselius.com/2025/02/03/exchange-2019-cu14-on-windows-2025/" class="more-link">Continue reading <span class="screen-reader-text">Exchange 2019 CU14 on Windows 2025</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>https://jaapwesselius.com/2025/02/03/exchange-2019-cu14-on-windows-2025/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">6817</post-id>
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		<item>
		<title>The Kerberos client received a KRB_AP_ERR_MODIFIED error</title>
		<link>https://jaapwesselius.com/2024/12/28/the-kerberos-client-received-a-krb_ap_err_modified-error/</link>
					<comments>https://jaapwesselius.com/2024/12/28/the-kerberos-client-received-a-krb_ap_err_modified-error/#respond</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Sat, 28 Dec 2024 16:21:16 +0000</pubDate>
				<category><![CDATA[Exchange]]></category>
		<category><![CDATA[Active Directory]]></category>
		<category><![CDATA[Domain Controller]]></category>
		<category><![CDATA[Exchange 2019]]></category>
		<category><![CDATA[Kerberos]]></category>
		<category><![CDATA[NETDOM]]></category>
		<category><![CDATA[Security]]></category>
		<category><![CDATA[technology]]></category>
		<category><![CDATA[Windows]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=6776</guid>

					<description><![CDATA[After starting an Exchange 2019 test environment, I noticed that several Exchange services would not start correctly. This happened on multiple Exchange 2019 servers. Sometimes, a reboot resolved it; sometimes, it went from all services running to several services not willing to start. This particular test environment had four Exchange 2019 servers and three Windows &#8230; <a href="https://jaapwesselius.com/2024/12/28/the-kerberos-client-received-a-krb_ap_err_modified-error/" class="more-link">Continue reading <span class="screen-reader-text">The Kerberos client received a KRB_AP_ERR_MODIFIED error</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>https://jaapwesselius.com/2024/12/28/the-kerberos-client-received-a-krb_ap_err_modified-error/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">6776</post-id>
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		<item>
		<title>No MFA in Microsoft 365 due to lost phone (locked out)</title>
		<link>https://jaapwesselius.com/2024/12/27/no-mfa-in-microsoft-365-due-to-lost-phone-locked-out/</link>
					<comments>https://jaapwesselius.com/2024/12/27/no-mfa-in-microsoft-365-due-to-lost-phone-locked-out/#comments</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Fri, 27 Dec 2024 16:48:35 +0000</pubDate>
				<category><![CDATA[Office365]]></category>
		<category><![CDATA[Authenticator app]]></category>
		<category><![CDATA[Azure]]></category>
		<category><![CDATA[Cloud]]></category>
		<category><![CDATA[lost phone]]></category>
		<category><![CDATA[MFA]]></category>
		<category><![CDATA[Microsoft]]></category>
		<category><![CDATA[Microsoft authenticator]]></category>
		<category><![CDATA[Security]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=6772</guid>

					<description><![CDATA[I have lost my phone and thus lost my Microsoft Authenticator app. Too bad, two admin accounts in two different tenants only have the Authenticator app configured. So, when logging on to a tenant, the password is accepted, and the second factor is requested. It&#8217;s too bad this won’t work since the new phone is &#8230; <a href="https://jaapwesselius.com/2024/12/27/no-mfa-in-microsoft-365-due-to-lost-phone-locked-out/" class="more-link">Continue reading <span class="screen-reader-text">No MFA in Microsoft 365 due to lost phone (locked out)</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>https://jaapwesselius.com/2024/12/27/no-mfa-in-microsoft-365-due-to-lost-phone-locked-out/feed/</wfw:commentRss>
			<slash:comments>1</slash:comments>
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">6772</post-id>
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		<item>
		<title>Email not delivered to DANE enabled domains in Office 365</title>
		<link>https://jaapwesselius.com/2024/08/07/email-not-delivered-to-dane-enabled-domains-in-office-365/</link>
					<comments>https://jaapwesselius.com/2024/08/07/email-not-delivered-to-dane-enabled-domains-in-office-365/#respond</comments>
		
		<dc:creator><![CDATA[jaapwesselius]]></dc:creator>
		<pubDate>Wed, 07 Aug 2024 08:02:24 +0000</pubDate>
				<category><![CDATA[Exchange]]></category>
		<category><![CDATA[Office365]]></category>
		<category><![CDATA[Cisco]]></category>
		<category><![CDATA[CVE]]></category>
		<category><![CDATA[DANE]]></category>
		<category><![CDATA[Exchange 2016]]></category>
		<category><![CDATA[Exchange Online]]></category>
		<category><![CDATA[IronPort]]></category>
		<guid isPermaLink="false">http://jaapwesselius.com/?p=6110</guid>

					<description><![CDATA[The servicedesk got complaints that email was not delivered to an organization, and that an NDR was never generated. The sending user never knew this, until the sender and receiver talked on the phone. Our organization was Exchange 2016 on-premises with a Cisco IronPort as a gateway to the Internet. The other (receiving) organization was &#8230; <a href="https://jaapwesselius.com/2024/08/07/email-not-delivered-to-dane-enabled-domains-in-office-365/" class="more-link">Continue reading <span class="screen-reader-text">Email not delivered to DANE enabled domains in Office 365</span> <span class="meta-nav">&#8594;</span></a>]]></description>
		
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