on-prem exchange

On-prem Exchange refers to Microsoft Exchange Server installed and managed locally within an organization's own infrastructure, as opposed to the cloud-based Exchange Online. Discussions on this tag focus on urgent security hardening, migration strategies, and hybrid configurations. Recent content highlights a joint NSA/CISA advisory treating on-prem Exchange as under imminent threat, urging immediate patching and migration from unsupported versions. Another thread covers Microsoft's mandate for a dedicated Exchange hybrid app in Entra ID, driven by a high-severity vulnerability, with enforced traffic blocks and a permanent cutoff deadline. Common themes include vulnerability remediation, hybrid coexistence with Exchange Online, and compliance with security directives.