Exchange Server 2019 Enterprise
YCQY7-BNTF6-R337H-69FGX-P39TY

Exchange Server 2019 Standard
G3FMN-FGW6B-MQ9VW-YVFV8-292KP

Microsoft Exchange Server 2016 Product Key
Enterprise: 7WJV6-H9RMH-F4267-3R2KG-F6PBY
Standard: QXYKC-7H87P-YKC2Q-XRVQ7-GTJP2

Office Online Server 2018 Key: P7NC4-K3X6B-D9VP7-YJKPM-X4TMJ