Microsoft Exchange and Active Directory Blog
Sometimes it may be necessary to install the Exchange Online Shell on an older operating system, for example if an older Exchange Server version is to be migrated to Exchange Online or Microsoft 365. However, when trying to install the shell, an error may occur where the error message is not entirely clear. The following error message can occur, ... Read more
From time to time it happens that you have to remove an email from your mailbox, for example because it should not have been sent in this way. Experience shows that this often happens with internal newsletters. The question often arises as to whether the mail has already been read, and if so, by how many recipients. With Exchange servers ... Read more
When routing emails in Exchange Hybrid mode, the following error may occur between Exchange on-prem and Microsoft 365 mailboxes when sending mails from a local mailbox (or an external sender) to an M365 mailbox: Remote Server returned '554 5.4.108 SMTPSEND.DNS.MxLoopback; DNS records for the next hop domain are configured in a loop -> ... Read more
Microsoft has released new security updates for all Exchange Server versions (2013 - 2019). These are likely to fix the vulnerabilities that were used in the Pwn2Own 2021 to attack Exchange Server. The following vulnerabilities are fixed: CVE-2021-28483 CVE-2021-28482 CVE-2021-28481 CVE-2021-28480 Here is a description from the Pwn2Own website, probably exactly this ... Read more
The relatively young company grammm wants to offer an alternative to Exchange Server with its product of the same name. The idea itself is not new, as there have long been a number of projects (such as Open-X-Change, Kopano or Zimbra) that position themselves as an alternative to Exchange Server. grammm (groupware and much much more), however, is the first to offer Open ... Read more
A single user was no longer able to access his mailbox after a database failure due to a full log file partition. The problem only affected one user, while all other users were able to access the mailboxes in the database again. A general problem with the database could therefore be ruled out. The settings of the ... Read more
During a server migration, the problem occurred that a certificate could not be exported. During the migration, only the operating system was to be replaced with a current version and the certificate was to continue to be used if possible. In this specific case, it was a wildcard certificate, but the setting "Private key ... Read more
On an Exchange 2016 server that had configured its certificate from Let's Encrypt with the WIN-ACME client, the installation of a CU was aborted with an error at step 16 of 18: Here is the full test of the error message: Error: The following error was generated when "$error.Clear(); Install-ExchangeCertificate -services "IIS, POP, IMAP" -DomainController $RoleDomainController if ($RoleIsDatacenter ... Read more
After the update is before the update. Today, Microsoft released the Cumulative Updates for Exchange Server 2016 and 2019. Both CUs contain the previous security updates from 02.03.21. CU 20 is the penultimate CU for Exchange Server 2016, after which only security updates will be released. For Exchange 2016, the last ... Read more
Microsoft provides the tool "Exchange On-premises Mitigation Tool (EOMT) to secure unpatched Exchange servers for download: https://github.com/microsoft/CSS-Exchange/tree/main/Security EOMT first secures the Exchange server against the vulnerability CVE-2021-26855 using URL rewrite and then downloads the Microsoft Safty Scanner to check the server for a successful attack. However, EOMT does not install the available updates ... Read more
