Microsoft Exchange and Active Directory Blog
After installing the July security updates, it may happen that the Exchange Administrative Center (EAC) and OWA can no longer be opened. The cause is an expired certificate for Exchange Server OAuth authentication. Microsoft also refers to this problem in the release notes of the updates. Unfortunately, the notes on the updates are overlooked ... Read more
A week ago, Microsoft released new security updates for Exchange Server 2013, 2016 and 2019. I'm only reporting on this now because I've been on vacation for the last 14 days. But thanks to the CVE reporter, this shouldn't be a problem :-) The following four vulnerabilities are closed by the updates CVE-2021-31196 CVE-2021-34470 CVE-2021-33768 CVE-2021-31206 Here's ... Read more
The new AMSI integration introduced with CU21 for Exchange 2016 and CU10 for Exchange 2019 in conjunction with various anti-virus scanners causes some serious problems. The Outlook connection sometimes becomes so slow that it is no longer possible to work. Even starting Outlook can take several minutes. Outlook repeatedly fails to respond, ... Read more
Microsoft has released new updates for Exchange Server 2016 and 2019 today. The CU21 now released for Exchange 2016 is the last CU to be released for Exchange 2016. From now on, there will only be security updates for Exchange 2016. Click here to download the CUs directly: Exchange Server 2019 ... Read more
From time to time it can be useful to get an overview of the Outlook versions in use. Every now and then you will certainly find old Office / Outlook versions that should no longer be in use. With Exchange 2016 / 2019 servers, the Outlook version can be removed with PowerShell from ... Read more
In the standard Active Directory setting, the display name is formed from the first and last name. However, many companies, mostly in German-speaking countries, change the generation of the display name to "last name and first name". This has the advantage that users are easier to find in the Exchange address book and in the Active Directory, as the sorting is based on the surname and ... Read more
Microsoft has released new security updates for all Exchange Server versions (2013 - 2019). This time it concerns the vulnerabilities that were successfully used in Pwn2Own 2021 to attack Exchange Server. The following vulnerabilities are fixed: CVE-2021-31209 CVE-2021-31207 CVE-2021-31198 CVE-2021-31195 Here is a description from the Pwn2Own website, presumably exactly this vulnerability is now fixed: The ... 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
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
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
