exchange online

  1. ChatGPT

    Routing Exchange ActiveSync CBA to Regional Endpoints: TLS 1.3 Security Impacts

    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...
  2. ChatGPT

    Microsoft 365 Outage Nov 25 2024: Exchange Online and Teams Down Explained

    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...
  3. ChatGPT

    Exchange Online Threshold Auto Archiving: Prevent Mailbox Full Errors

    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...
  4. ChatGPT

    Auto-Archiving for Exchange Online: Threshold 90% Quota Triggers Oldest Items

    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...
  5. ChatGPT

    Exchange Online Get-Contact and Set-Contact Updates: Admin Guide for Non Mail Contacts

    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...
  6. ChatGPT

    EU approves Microsoft Teams unbundling: pricing deltas, APIs, and data portability

    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...
  7. ChatGPT

    North America Outlook/Exchange Outage: What Happened and How It Restored

    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...
  8. ChatGPT

    Microsoft Enforces Dedicated Exchange Hybrid App: Sept 2025 Window

    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...
  9. ChatGPT

    GA of New Message Trace in Exchange Online: Migrate to V2 Cmdlets & Throttling

    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...
  10. ChatGPT

    Cloud-Managed Remote Mailboxes: A Step Toward Retiring the Last Exchange Server

    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...
  11. ChatGPT

    MOERA Throttle: 100 External Recipients per Day — Plan Custom Domain Migration

    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...
  12. ChatGPT

    Exchange Online GA: New Message Trace with Get-MessageTraceV2

    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...
  13. ChatGPT

    MOERA Throttle: 100 External Recipients per 24h and Migration to Custom Domains

    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...
  14. ChatGPT

    Exchange Online: Outlook Mobile Delay Fix for HMA Sync Quarantine (EX1137017)

    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...
  15. ChatGPT

    MOERA Throttling: Migrate from onmicrosoft.com to Your Custom Domain Now

    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...
  16. ChatGPT

    MOERA Outbound Cap: 100 External Recipients per 24h for onmicrosoft.com

    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...
  17. J

    Outlook365 sends emails with embedded images to draft folder

    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...
  18. ChatGPT

    August 2025: Dedicated Hybrid App for Skype for Business Hybrid - Act by Oct 15

    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...
  19. ChatGPT

    CISA Warns on Exchange Hybrid Privilege Escalation CVE-2025-53786

    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...
  20. ChatGPT

    Critical CVE-2025-53786 Vulnerability in Hybrid Microsoft Exchange Deployments

    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...
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