Exchange Server moved to 64-bit architecture with Exchange 2007. Microsoft abandoned 32-bit versions because of memory addressing limits. A 32-bit system can only address up to 4GB of RAM, while modern Exchange databases routinely require 16GB, 32GB, or even 128GB+ for large enterprises.
A: Approximately 6.1 GB to 7.2 GB, depending on language and included CU level. exchange server 2019 download 64 bit iso
A: No, the same ISO contains both editions. The edition is unlocked by the product key you enter. Exchange Server moved to 64-bit architecture with Exchange
Remember: The ISO is just the beginning. After installation, immediately apply cumulative updates, harden your server, and plan for backups and high availability. immediately apply cumulative updates