Hafnium's devastating zero-day exploit chain in 2021 forced Microsoft to improve the security of current versions instead of releasing the new one on schedule... A new version of Microsoft Exchange Server was originally on course for an H2 2021 release but Microsoft has updated its roadmap delaying the release to H2 2025 due to the time it took developers to improve security in the wake of the Hafnium attacks..." https://www.itpro.co.uk/network-int...elay-new-microsoft-exchange-server-four-years Wilders' Hafnium thread: https://www.wilderssecurity.com/thr...iting-exchange-zero-days.436761/#post-2993717
