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.