Microsoft is routing Exchange ActiveSync Certificate‑Based Authentication (CBA) traffic to new, dedicated CBA endpoints by cloud region — a seemingly small change with important operational and security consequences for any organization that terminates, inspects, or filters ActiveSync traffic at...
Microsoft’s cloud suffered a high-profile disruption that left thousands of users locked out of email, calendars and collaboration tools — and briefly ignited reporters and gamers alike as social feeds filled with “Microsoft 365 down,” “Teams down” and even scattered claims that Minecraft...
Microsoft is rolling out a built-in safety valve for Exchange Online that aims to make the dreaded "mailbox full" error far less common: a new threshold-based auto‑archiving mechanism will automatically relocate the oldest eligible items from a mailbox to its archive once the primary mailbox...
Microsoft is introducing an automatic, threshold-driven archiving feature for Exchange Online — Auto-Archiving — that will begin rolling out to public clouds on October 15, 2025 and to government clouds the following month; when enabled for a mailbox that already has an archive provisioned, the...
Headline
Updates to Get-Contact and Set-Contact in Exchange Online — What admins must know (announcement, impact, detection, remediation, and migration guidance)
Summary (TL;DR)
Microsoft announced on Oct 7, 2025 that Exchange Online will stop returning or allowing management of Contact...
Microsoft and the European Commission have reached a binding settlement that will reshape how Microsoft 365, Office 365, and Microsoft Teams are sold and integrated across Europe — and, in practice, globally — by enforcing unbundling, minimum price deltas, expanded interoperability APIs, and...
antitrust
appsource
centralized developer portal
data portability
entra id
european economic area
european union
exchangeonline
interoperability
microsoft 365
microsoft teams
migration apis
office 365
onedrive
price deltas
regulatory commitments
sharepoint online
unbundling
Microsoft confirmed a regional outage that left Outlook and Exchange Online users in North America struggling with login failures, server-connection errors and delayed mail delivery, then rolled back changes and applied optimizations to restore service — while choosing not to publish full...
admin center
authentication failures
cloud outage
cpu utilization
exchangeonline
incident
incident response
login issues
mail delivery delays
message trace
microsoft 365
north america
optimization
outage
outlook
outlook outage
restoration
rollback
service health
telemetry
Microsoft is taking the first concrete step in its phased enforcement of the dedicated Exchange hybrid app requirement: on September 16, 2025 at 07:00 UTC Microsoft will temporarily block Exchange Web Services (EWS) traffic that uses the Exchange Online shared service principal for hybrid...
Microsoft has pushed the refreshed Message Trace for Exchange Online out of preview and into general availability for worldwide (WW) tenants, triggering a hard look at automation, reporting integrations, and long-running scripts that rely on the legacy message-tracing stack; admins must plan now...
automation
compliance
data ingestion
exchangeonline
ga rollout
get-messagetracedetailv2
get-messagetracev2
graph api
historical data
message trace
migration
new message trace
powershell v3
reporting webservice
resultsize
siem
tenant throttling
throttling
time zones
Microsoft’s Exchange team has taken a decisive step toward finally letting organizations retire the last Exchange server in hybrid environments by adding cloud-managed remote mailbox support — a per-mailbox “flip-the-switch” that transfers Exchange attribute authority to Exchange Online while...
Microsoft is imposing a hard cap on outbound email sent from the shared onmicrosoft.com tenant namespace: mail from MOERA (Microsoft Online Email Routing Address) domains will be throttled to 100 external recipients per organization in any 24‑hour rolling window, with attempts beyond that...
Microsoft has moved the revamped Message Trace experience in Exchange Online out of preview and into general availability, bringing a faster UI, new PowerShell cmdlets, extended query windows, and new operational constraints that will change how administrators automate and extract trace data...
10 days per request
90 days
admin-center
automation
compliance
data ingestion
deprecation
enddate
exchange admin center
exchangeonlineexchange-online
ga
ga rollout
ga-release
get-messagetracedetailv2
get-messagetracev2
graph api
graph-api
historical data
legacy ux
message trace
message-trace
messagetraceid
migration
monitoring
new message trace
new-message-trace
powershell
powershell v3
query window
reporting webservice
reporting-webservice
resultsize
security
siem
startingrecipientaddress
tenant throttling
tenant-cap
throttling
time zone
time zones
trace-filtering
Microsoft’s Exchange team has announced a sweeping, tenant-level restriction that will limit outbound email sent from the shared onmicrosoft.com namespace (MOERA — Microsoft Online Email Routing Address) to 100 external recipients per organization per 24‑hour rolling window, and the change comes...
Microsoft has acknowledged and begun rolling out a fix for a troubling Exchange Online regression that left some Outlook mobile users unable to send or receive mail — a problem traced to Hybrid Modern Authentication (HMA) and tracked inside the Microsoft 365 Admin Center as incident EX1137017...
admin guidance
change validation
cloud optimization
ex1137017
exchangeonline
hma
hybrid identity
hybrid modern authentication
incident management
incident response
mail delivery delays
microsoft 365
mobile sync
outlook mobile
runbooks
service degradation
service health
sync quarantine
teams tm1134507
telemetry observability
Microsoft has given a clear ultimatum to organizations still using the shared .onmicrosoft.com sending address: migrate to a verified custom domain or expect severe outbound throttling that will constrain external email to just 100 external recipients per organization in any 24‑hour rolling...
Microsoft is imposing a hard limit on outgoing email from free “.onmicrosoft.com” (MOERA) tenant domains to combat widespread abuse and protect delivery for legitimate Microsoft 365 customers, and the change — which takes effect in staged waves starting October 15, 2025 for trials — restricts...
I am using Win 11 with Office 365 at home. Yes everything is up to date with the latest everything. Let me repeat...everything is up to date.
Here is the issue. First I use the snipping tool to capture and image, then paste that image into a new email I'm writing. It works fine. However...
clipboard
drafts folder
drafts not sending
email delivery
email troubleshooting
exchangeonline
image paste
mail sync issue
office 365
office apps
outlook
outlook performance
paste image issue
sent items
snipping tool
windows 11
windows updates
Microsoft’s August 2025 hotfixes for Skype for Business Server introduce a security-first change that will force organizations with hybrid deployments to act quickly: a new, customer-managed Dedicated Hybrid Application model replaces the long-standing Microsoft-managed shared service principal...
app registration
auditability
aug 2025 hotfix
dedicated hybrid application
entra id
esu
ews
exchangeonline
hybrid configuration
hybrid enforcement
hybrid security
microsoft entra id
october 15 2025
on-prem to cloud hybrid
security hardening
skype for business
skype meetings application
A new wave of cybersecurity urgency is sweeping through IT departments as the Cybersecurity and Infrastructure Security Agency (CISA) issues a fresh, high-severity warning concerning Microsoft Exchange Server. The alert, centered around CVE-2025-53786, underscores a newly disclosed vulnerability...
ai malware classification
cisa
cloud security
cve-2025-53786
end of life
exchange hybrid
exchangeonline
hybrid cloud security
hybrid deployment
identity security
incident response
microsoft exchange server
patch management
privilege escalation
project ire
public-facing servers
security advisory
service principal
zero trust
A critical security vulnerability, identified as CVE-2025-53786, has been discovered in hybrid deployments of Microsoft Exchange Server. This flaw allows attackers with local administrative access to escalate their privileges within connected cloud environments, posing significant risks to...
black hat conference
cisa alerts
cve-2025-53786
cyber threats
cybersecurity
cybersecurity threats
exchange hotfix
exchangeonlineexchange server 2016
exchange server 2019
exchange server security
hybrid deployments
microsoft exchange
privilege escalation
secure cloud environments
security best practices
security mitigation
security updates
security vulnerability
service principal security