Microsoft Exchange and Active Directory Blog
The updates for Windows Server which were released on February 19, 2019 after the regular patchday are also important for Exchange Server running on Windows Server 2016. Specifically, it is about a problem that has existed since September 2018: KB4457127 causes problems on DCs in connection with Exchange KB4457127 causes problems after installation ... Read more
New updates have just been released for all supported Exchange Server versions, which also fix the critical vulnerability from CVE-2018-8581. The updates should therefore be installed as soon as possible, as an exploit for this vulnerability has existed for some time. Click here to download the updates for Exchange 2010, 2013 and 2016: Cumulative Update 12 ... Read more
It can happen that the paths or the storage location of Exchange databases and log files have to be changed, for example when changing the storage system. This article is in response to a reader's question about how to do this with as little downtime as possible. There are several options for moving the database and log file paths, ... 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
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
Microsoft has released a security update for Exchange 2016 CU 10 and CU 11. The update fixes a tampering vulnerability that has been rated as "Important": A tampering vulnerability exists when Microsoft Exchange Server fails to properly handle profile data. An attacker who successfully exploited this vulnerability could modify a targeted user's profile data. To exploit the ... Read more
In the last part of the article series "Migration from Exchange 2016 to Exchange 2019", the uninstallation of Exchange 2016 is prepared and the migration completed. The small Troubleshooting section is dedicated to the most common cause of failed or stopped MoveRequests. During migrations, problems can always occur that could not be ruled out beforehand. The causes can be ... Read more
In part 3 of the article series "Migration from Exchange 2016 to Exchange 2019", it is now time to migrate the data. Specifically, it is about moving the various mailboxes and public folders from Exchange 2016 to Exchange 2019. I am moving the various mailbox types individually here, if no public folders or shared mailboxes (shares) are used, you can ... Read more
