Exchange Online Disables New Inbound Connectors

Exchange Online will create a new inbound connector but won't activate it until the tenant gives a business justification to Microsoft Support. The restriction applies only to tenants created after January 1, 2023. Microsoft isn't saying why they implemented the restriction, but it's likely because of a security concern. In any case, the deafening silence from Microsoft has left ISVs that depend on inbound connectors in a very bad place.