Microsoft Exchange and Active Directory Blog
In the second part of the migration from Exchange 2016 to Exchange 2019 CU15, Exchange 2019 was configured. This part now deals with the migration of the mailboxes to the new server. Finally, the old Exchange 2016 server can be uninstalled and the migration completed. Migrating the mailboxes The mailboxes can be migrated via the Exchange Admin Center ... Read more
The current CU15 for Exchange Server 2019, like the CU14, has been released for Windows Server 2025. The CU15 supports the inplace upgrade to Exchange Server SE RTM. However, the Inplace Upgrade only supports the upgrade of the Exchange installation. The operating system cannot be upgraded via Inplace Upgrade. So if you want to upgrade from October 2025 ... Read more
The new Exchange Server version is expected this year. It makes sense to start working on the migration of existing Exchange 2016 servers to Exchange SE now, as the time window for the migration is short. However, this is not a problem if you prepare in good time. This article is about the migration of ... Read more
Microsoft has now also released Exchange Server 2019 CU14 for Windows Server 2025. Originally, CU15 was to be released for Windows Server 2025 first, but this step has now been brought forward. The release of CU14 for Windows Server 2025 serves as preparation for the upgrade to Exchange Server SE. This means that existing Exchange Servers can now be upgraded to ... Read more
The latest Cummulative Update for Exchange Server 2019 has been postponed again Originally, CU 15 for Exchange 2019 was supposed to be released in December 2024, but the release was postponed to January 2025. On the last day of January, a message appeared on the Exchange Team Blog stating that CU 15 had been postponed again. The CU15 will be the ... Read more
Since the Exchange Server April 2024 Hotfix Update, Exchange Server 2019 also supports ECC (Elliptic Curve Cryptography) certificates. However, there are a few things to bear in mind when using ECC certificates. In the following article, we take a look at what you need to consider. What are ECC certificates ECC certificates (Elliptic Curve Cryptography) are certificates that are based on ... Read more
It can happen that Exchange 2019 servers log the EventID 1006 (source: MSExchange Mailbox Replication). The text of the warning is as follows: The warning occurs approximately every 2 minutes. The warning occurs when a database has been deleted and is fortunately very easy to resolve. These are not problems with ... Read more
Today, mainstream support for Exchange Server 2019 has expired, so both Exchange Server versions that are still supported are now in extended support, which ends on October 14, 2025. While Exchange 2016 will only receive security updates, Exchange 2019 will receive two more CUs. The CU14 for Exchange 2019 will be released soon and CU15 will also be ... Read more
CU13 for Exchange Server 2019 was released yesterday. The CU13 contains all previous security updates and brings new features for Exchange Server 2019. The CU13 can be downloaded here: CU13 finally brings Modern Authentication (OAuth 2.0) for on-prem Exchange Server. Until now, Modern Authentication was only available in conjunction with the hybrid configuration, i.e. ... Read more
During an Exchange 2016 to Exchange 2019 migration, no mailboxes could be moved to the new Exchange 2019 databases. The MoveRequests got stuck at 0% and showed the error StalledDueToSource_DiskLatency: No matter how big or small the mailbox was: No mailbox could be moved. Directly after creating the MoveRequest, the error StalledDueToSource_DiskLatency was displayed. Also ... Read more
