Microsoft Exchange and Active Directory Blog
Update 25.02.2019: There is a new article here, as this article is no longer valid. Update 29.01.2019: See note/update at the end of the article. DGNcert is not stored as a trusted certification authority in Windows as I claimed. Therefore, please read the update at the end of the article first and then the comments. So far, Comodo has been a reliable ... Read more
I have now received a lot of questions about Outlook on Windows 7 in conjunction with Exchange 2019. The error and solution have always been the same, so here is a short article about it. Outlook (regardless of the version) on Windows 7 cannot connect to Exchange Server 2019. Outlook then displays this message at startup ... Read more
There is currently a security vulnerability in all Exchange Server versions, which makes it possible to obtain domain administrator authorizations via EWS or, for example, to redirect emails. What makes this vulnerability particularly critical is that it can be exploited remotely. The attacker only needs to have access to a mailbox on the Exchange Server. Since the EWS API and often also ... Read more
Exchange 2019 has adopted the familiar principle of the Database Availability Group (DAG). There are no major changes to the DAG. However, something has changed in the databases. The index is now part of the database and no longer ghosts around separately in the file system. Exchange 2019 also offers the option of using SSDs as ... Read more
Just a little reminder: Support for Exchange Server 2010 ends on 14.01.2020. Exchange 2010 has been in the Extended Support phase for some time, so it only receives security updates. From January 14, 2020, there will no longer be any technical support from Microsoft. This means that support requests can no longer be opened and ... Read more
This short article is intended to list the most common causes of problems with the Outlook connection to Exchange during migration. Connection problems often occur after a mailbox has been moved to a newer Exchange version. Outlook then often displays one of the following messages: The Microsoft Exchange administrator has made a change that requires Outlook to be restarted. ... Read more
Yesterday, Microsoft released a security update for Exchange 2016 and Exchange 2019. The update is classified as "Important" and should therefore be installed promptly. Here is the description of the vulnerability: A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory. An attacker who successfully exploited ... Read more
When creating new databases in an Exchange 2016 organization, I encountered the following problem. The databases could be created within EAC and Shell without any problems. However, after the databases were created, they could not be mounted and remained in the status "unmounted". Unfortunately, at first glance the error message in EAC ... Read more
DMARC is based on the SPF (Sender Policy Framework) and DKIM (Domainkeys Identified Mail) technologies. DMARC can be used to determine how a recipient should deal with a mail that does not correspond to the sender's DKIM or SPF settings. In addition, the recipient can send reports to the sender for evaluation. In this way it is possible ... Read more
MTA-STS (Mail Transfer Agent-Strict Transport Security, STS for short) is a fairly new tool for making sending and receiving mail more secure. MTA-STS has now been adopted as RFC-8461 and can therefore be used. Similar to DANE, information is stored in the DNS for STS. The big difference, however, is that STS does not require DNSSEC ... Read more
