Please see Update on Transport Enforcement System in Exchange Online for an updated timeline.
2/20/2025: Please note that thottling/blocking has now been enabled for all versions of Exchange Server...
Updated Feb 20, 2025
Version 8.0
Blog Post
10 MIN READ
Throttling and Blocking Email from Persistently Vulnerable Exchange Servers to Exchange Online
KevinShaughnessy I would say both MC and SH announcements are in order. I personally would emphasize the dire need for documentation for these cmdlets:
New-TenantExemptionInfo
Get-TenantExemptionInfo
Get-OnPremServerReportInfo
Currently there's no way of telling what values does parameter 'BlockingScenario' accept for example. Or what impact does each attribute outputted by Get-OnPremServerReportInfo have. For example: if 'Build' attribute says '15.1.2507.35' and 'RecommendedBuildVersions' includes it then why do I have a 'NextStageStartDate' populated? You (the cmdlet output) are telling me my build is among the recommended builds so I get the impression there should be no action from my side...
Not to mentioned cmdlets 'Get-TenantExemptionQuota' and 'Get-TenantExemptionQuotaEligibility' which you cannot find online at all:
PS C:\> Get-TenantExemptionQuota -BlockingScenario UnpatchedOnPremServer
TenantId : //redacted//
BlockingScenario : UnpatchedOnPremServer
SequenceNumber : 0
AllotedQuota : 90
QuotaYear : 2024
EffectiveFrom : 1/1/2024 12:00:00 AM
IsApproved : True
Thanks
Victor