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Das Blog Cumulative Update für August 2021 (CU0821) fasst interessante Themen rund um Cloud Sicherheit, Exchange Server, Office 365, Microsoft Teams und Azure des Monats August 2021 zusammen. Allgemein [STICKY] Modern Collaboration Architecture (MOCA) [STICKY] Microsoft Products Reaching End of Support for 2020 Enabling HTTP/3 support on Windows Server 2022 7 ways to harden your environment against compromise How to Manage AD Replication with Repadmin [Lots of Examples]   Exchange Server [STICKY] Microsoft Exchange Server Support Scripts [STICKY] Outlook License Requirements for Exchange Features ProxyShell vulnerabilities and your Exchange Server Unarchiving Mailbox Items Exchange Server 2019 - No Public Folders available Exchange Server Questionnaire How to update AD schema to address CVE-2021-34470 if Exchange is very old or no longer installed   Microsoft 365 | OneDrive | Exchange Online | and more [STICKY] Microsoft Compliance Configuration Analyzer (MCCA) [STICKY] Office 365 Network Performance Tool [STICKY] Office 365 Support and Recovery Assistant (aka SaRA) [STICKY] Office 365 URLs and IP address ranges [STICKY] Office 365-Trust Center Sending a MimeMessage via the Microsoft Graph using the Graph SDK, MimeKit and MSAL Temporary server error. Please try again later ...

Mit der Veröffentlichung von Azure AD Connect 2.0 naht nun auch das Ende der Unterstützung der Vorversion Azure AD Connect 1.x.  Der Stichtag für das Ende der Unterstützung von Azure AD Connect 1.x ist der 31. August 2022. Bis zu diesem Datum müssen Sie Ihre Azure AD Connect Instanzen auf den aktuellen Azure AD Connect 2.x Release umgestellt haben, um weiterhin Ihre hybriden Identitäten mit Azure AD zu synchronisieren.  Beachten Sie bitte, dass mit Azure AD Connect 2.0 die Unterstützung von Windows Server 2012 und Windows Server 2012R2 beendet wurde. Wenn Sie aktuell AAD Connect auf einem dieser Betriebssysteme betreiben, so müssen Sie für Azure AD Connect 2.x ein neues System mit einem der folgenden Betriebssysteme nutzen: Windows Server 2016 Windows Server 2019 Sollte Ihre aktuell verwendete Version von AAD Connect 1.x veraltet sein, so kann ich nur dringend empfehlen, auf den aktuellen 1.6.x Release zu aktualisieren. Für eine Migration auf ein neues System stehen Ihnen mehrere Wege zur Verfügung. Die Online-Dokumentation stellt Ihnen die notwendigen Informationen zur Verfügung: Import and export Azure AD Connect configuration settings Azure AD Connect: Upgrade from a previous ...

The Problem Mail flow from on-premises devices and applications to Exchange Online is a tricky topic. The documentation allows for different solutions. Recently a client ran into a situation where an on-premises application was not able to deliver messages to a configured inbound connector in the Exchange Online tenant. The connector was configured for remote IP address selection. Exchange Online responded to each connection attempt with the following error message: 451 4.4.3 Temporary server error. Please try again later ATTR3.1 There weren't any changes on the on-premises configuration and the setup was in use for multiple months without any issues.   The Solution It took some time to identify the solution, but in the end, the solution was easy. Disabling and re-enabling solved the issue.     Enjoy Exchange Online.  

The Problem You might face a situation during an Exchange Server migration where your Exchange Server 2019 mailbox users are not able to open their public folder favorites when using Outlook on the Web (OWA). When your users try to access a public folder, they receive an error message.   This error occurs when the public folder mailboxes are still hosted on a previous version of Exchange Server. This includes Exchange Server 2016 and 2013. The online documentation explains, why this is happening: Access public folders located on servers running previous versions of Exchange   The Solution The solution to this problem is easy. Move the public folder mailboxes to Exchange Server 2019 before you migrate any user mailboxes.  This approach ensures that mailboxes hosted on Exchange Server 2019 and previous versions of Exchange Server are able to access public folders using Outlook on the Web.   Links Exchange Server 2019 - FAQ Client Limitations   Enjoy Exchange Server.    

The Microsoft 365 Collaboration BootCamp takes place on 21th & 21st  August 2021. The event addresses collaboration and best practices for using Microsoft Teams, SharePoint, Lists, Groups, and Microsoft Security & Governance. I am honored to speak about one of my favorite Topics: Microsoft Teams and On-Premises Mailboxes - Troubleshooting 101 Join my session on Saturday 21st August at 12:00 pm (GMT/UTC)   Learn more about the conference here: https://events.powercommunity.com/microsoft-365-bootcamp/ Register today to secure your seat.          

The Exchange Product Group announced Exchange Server vNEXT for fall 2021. angekündigt. We are all very excited to see what the new version has to offer. But what is the current situation in on-premises Exchange organizations? I have put a short questionnaire online for gathering information from you.  The questionnaire deals with the currently used product versions of Exchange Server, the size of your Exchange organization in terms of the number of servers and mailboxes, and the use of planning for a hybrid configuration with Exchange Online. Take the questionnaire following this link: https://forms.office.com/r/d9syBcgkMk Thank you for your participation.   Viel Spaß mit Exchange Server.  

When you create or update an Exchange hybrid configuration using the Hybrid Configuration Wizard magic things happen. That's why it is called a Wizard. One essential step of the Hybrid Configuration Wizard (HCW) is the configuration of the hybrid mail-flow. The hybrid mail-flow is required for both, classic and modern Exchange hybrid.  The wizard asks you to select one or more Exchange servers that you will utilize for handling inbound mail traffic from Exchange Online to your on-premises organization. You either configure direct mail flow to your Exchange Mailbox Servers in your internal company network, or to your Edge Transport Servers located in the perimeter network. The following screenshot example shows the selection dialogue.   You can only select a server object, but not a receive connector on that selected server. The HCW chooses the "right" receive connector on the selected servers for you. If you are using the default set of receive connectors, you will not encounter any issues. HCW will use the default frontend connector on a mailbox server. When you use an Edge Transport Server you will run into any trouble as well. There ...

Recently I had to support the uninstall of Exchange Server 2016 CU10 on a Windows Server 2019 system. That this setup is not supported is a different topic. In this case, a new Exchange Server 2016 system was placed in service, and the old system needed to be removed from the on-premises Exchange organization. We mounted the Exchange 2016 CU10 ISO, and ran the following command from an administrative command line: Setup.exe /mode:uninstall   Prerequisites Checks The prerequisites check failed with an odd error: http://terenceluk.blogspot.com/2017/01/attempting-to-delete-exchange-server.html Querying for any incompleted public folder migration requests returned no results. But the prerequisites check insisted that there was an existing public folder migration request. In such a case you already know that you have to use ADSIEdit to find the object in question.  It turned out that the prerequisites check was right, as we found a single public folder migration request in the Active Directory configuration partition. The request was an artifact of an unsuccessful migration attempt in 2019. After we have checked that the current modern public folder hierarchy worked as expected, we deleted the artifact from Active Directory. Now the ...

I am honored to speak at CloudEight Virtual Summit 2021. CloudEight is a conference about Microsoft 365 related topics and takes place for the third time.    My session covers the topic "Microsoft Teams and On-Premises Mailbox - Why?" What are the reasons for using Microsoft Teams with on-premises mailboxes, what are the technical requirements, and why is this approach not necessarily a good idea? Register today. Looking forward to seeing you at the virtual conference.   Links CloudEight Virtual Summit Event Homepage    

The use of Microsoft Viva requires using a modern SharePoint site as a home site.  The documentation for enabling Microsoft Viva describes how to set a new SharePoint Online Home Site, but lacks an important step. You must swap the new home site and current home site, in addition to setting the SharePoint Online home site. The swap cmdlet archives the current home site.  # Replace with the new home site URL $NewHomeSiteUrl = 'https://varunagroup.sharepoint.com/sites/Varuna' # Replace with current home site URL $CurrentHomeSiteUrl = 'https://varunagroup.sharepoint.com/' # Replace with an archive URL $ArchiveUrl = 'https://varunagroup.sharepoint.com/sites/oldhomepage' Invoke-SPOSiteSwap -SourceUrl $NewHomeSiteUrl -TargetUrl $CurrentHomeSiteUrl -ArchiveUrl $ArchiveUrl   Links Install Viva Connections today    

  I am honored to speak at Teams Nation 2021 on 12th May about Microsoft Teams Admin Roles and Teams Admin Center.  Register today and visit my session in room Teams Nation Germany (TCD). As suspected, the session will be in German. Teams Nation is a community conference and offers 115 sessions in 11 tracks. Visit the conference site and register today.   Teams Nation Conference Teams Nation Schedule Register for Teams Nation Conference  

Being in a situation where you need to recover IT components or even a whole IT infrastructure after a disastrous event can be stressful. It would help if you stayed concentrated while dealing with the constant status requests by the management. In such a situation, it can help to isolate your mind by listening to music. Music that helps you focus your thoughts, anger, and feelings in such a moment. Maybe you find my Spotify playlist helpful. The playlist contains about 12 hours of music. IT Recovery Playlist Listening to music using a headphone is good, but playing music loud and feeling the rhythm and every single bass is much better. Enjoy.