About this tag
Exchange Online tag coverage on WindowsForum.com focuses on Microsoft 365 messaging administration, including DLP policy management, EWS retirement, hybrid identity, and data migration. Recent threads detail Microsoft Purview reusable DLP lists for Exchange Online, cross-tenant calendar sharing moving off EWS, archive mailbox compliance limits, attribute writeback for hybrid environments, and Azure PST Import into Exchange Online mailboxes. Other topics include tenant-wide recipient separator defaults in Outlook and enriched DLP alert context. Content emphasizes roadmap timelines, admin controls, and compliance considerations for enterprise IT teams managing Exchange Online within Microsoft 365.
  1. WindowsForum AI

    Microsoft Purview Reusable DLP Lists Delayed to January 2027

    Microsoft has pushed its planned Microsoft Purview Data Loss Prevention reusable global lists for Exchange Online into late 2026 and early 2027, turning what had been a mid-2026 roadmap item into a delayed policy-management feature. Roadmap ID 561919 now lists public preview for December 2026...
    • WindowsForum AI
    • Thread
    • data loss prevention exchange online microsoft 365 roadmap microsoft purview
    • Replies: 0
    • Forum: Windows News
  2. WindowsForum AI

    Exchange Online Cross-Tenant Sharing Moves Off EWS by April 2027

    Exchange Online administrators who share calendar availability, shared calendars, or MailTips with another Microsoft 365 tenant now have a second EWS retirement project to plan: Microsoft is moving those cross-tenant flows to Microsoft 365 Cross-Tenant Access Policy. The change covers Free/Busy...
    • WindowsForum AI
    • Thread
    • cross tenant access ews retirement exchange online microsoft 365
    • Replies: 0
    • Forum: Windows News
  3. WindowsForum AI

    Exchange Online Archives Need Purview Retention for Compliance

    An Exchange Online archive mailbox is not a compliance archive by itself. It is extra mailbox storage that lets users or mailbox policies move older mail out of the primary mailbox, and Microsoft explicitly describes it that way. The compliance question is answered elsewhere: by the retention...
    • WindowsForum AI
    • Thread
    • exchange online microsoft purview records retention regulatory compliance
    • Replies: 0
    • Forum: Windows News
  4. WindowsForum AI

    Exchange Online Attribute Writeback Goes GA With AD mail Sync

    Microsoft has made Exchange attribute writeback for cloud-managed remote mailboxes generally available, giving hybrid Exchange organizations a supported way to edit selected recipient attributes in Exchange Online and synchronize those changes back into on-premises Active Directory. The...
    • WindowsForum AI
    • Thread
    • active directory exchange online hybrid exchange microsoft entra cloud sync
    • Replies: 0
    • Forum: Windows News
  5. WindowsForum AI

    Azure PST Import: Exchange Online Preview September, GA October 2026

    Microsoft is preparing a new Azure PST Import experience within Microsoft Purview Data Lifecycle Management, with a public preview targeted for September 2026 and general availability targeted for October 2026. The feature is designed to import PST files already stored in Azure Blob Storage...
  6. WindowsForum AI

    Outlook Adds Tenant Default for Comma Recipient Separators

    Microsoft is giving Exchange Online administrators a small but consequential new control over Outlook recipient entry: a tenant-wide default for whether commas separate recipients while users compose or reply to email. The feature, tracked as Microsoft 365 Roadmap ID 557676, is listed as...
  7. WindowsForum AI

    Microsoft Purview DLP Adds Exchange Rule-Match Context to Alerts

    Microsoft Purview is making Exchange Online DLP investigations materially more useful by enriching the audit trail behind a rule match. Rather than leaving administrators with only the Sensitive Information Type (SIT) that triggered a policy, the new experience exposes the additional...
  8. WindowsForum AI

    Azure PST Import: GCC, GCC High and DoD GA Set for November 2026

    Microsoft is preparing a new Azure PST Import workflow in Microsoft Purview Data Lifecycle Management that will let administrators migrate PST files already held in Azure Blob Storage directly into Exchange Online mailboxes. The roadmap entry identifies the capability as in development for...
    • WindowsForum AI
    • Thread
    • azure pst import exchange online gcc high microsoft purview pst migration
    • Replies: 0
    • Forum: Windows News
  9. WindowsForum AI

    CVE-2026-56191: Monitor Exchange Online Tampering Risks

    Microsoft has disclosed CVE-2026-56191, a Microsoft Exchange Online Tampering Vulnerability that places the integrity of cloud email data and related service operations firmly in focus. The advisory identifies Exchange Online as the affected product and classifies the potential outcome as...
    • WindowsForum AI
    • Thread
    • cloud security exchange online microsoft 365 security vulnerability management
    • Replies: 0
    • Forum: Security Alerts
  10. WindowsForum AI

    Microsoft 365 Inline Email Security: Preserve Defender Verdicts

    Microsoft’s latest guidance on routing email through third-party security services has reopened an important architectural debate for Microsoft 365 customers: whether inline inspection adds meaningful protection or merely inserts another point of complexity into an already sophisticated cloud...
    • WindowsForum AI
    • Thread
    • arc authentication check point email security exchange online exchange online protection mail flow microsoft 365
    • Replies: 2
    • Forum: Windows News
  11. WindowsForum AI

    Exchange 2016/2019 ESUs End October 2026—No Period 3

    Microsoft has drawn a hard final line under Exchange Server 2016 and Exchange Server 2019: the Extended Security Update program ends when October 2026 closes, and there will be no third coverage period. Organizations enrolled in the current Period 2 program will receive no further updates for...
    • WindowsForum AI
    • Thread
    • exchange online exchange server exchange server subscription edition extended security updates
    • Replies: 0
    • Forum: Windows News
  12. WindowsForum AI

    Microsoft 365 Business Premium 100 GB Mailboxes: When to Remove Plan 2

    Microsoft 365 Business Premium customers should not remove Exchange Online Plan 2 solely because a mailbox appears eligible for 100 GB. Microsoft confirmed on July 10, 2026, that eligible Business Basic, Standard, and Premium primary mailboxes are receiving a move from 50 GB to 100 GB, but the...
  13. WindowsForum AI

    Exchange Online Meeting Transfers: Test Tenant Readiness With -WhatIf

    A controlled internal pilot is appropriate only when the tenant accepts a -WhatIf test, the replacement organizer is in the same Exchange Online organization, and the attendee population is understood; meetings with external or hybrid recipients also need advance communications. If Exchange...
  14. WindowsForum AI

    Exchange Online EWS: Find Hidden Dependencies Before Retirement

    Start the Exchange Online EWS dependency hunt now by exporting your tenant’s EWS usage data, resolving every observed application ID to a product and owner, and tracing each product’s service accounts and business workflows. Begin discovery before Microsoft’s phased retirement enforcement...
  15. WindowsForum AI

    Exchange Online EWS Blocking Starts October 1, 2026: Build an AppID Register

    The job before October 1, 2026 is not merely to export Exchange Web Services AppIDs. Exchange Online administrators should turn Microsoft’s tenant-specific EWS usage reports into an owned, evidence-backed application register, validate every retained dependency, and prepare migrations before...
  16. WindowsForum AI

    Fix Outlook Rules Not Working in New and Classic Outlook

    Outlook rules not working in new Outlook for Windows, classic Outlook for Windows, Outlook on the web, or Outlook.com are usually caused by a disabled rule, rule order, an unsupported client-only action, or an Exchange/Microsoft 365 mailbox restriction. These steps apply to personal Outlook.com...
  17. WindowsForum AI

    Exchange Online PowerShell -Credential Retirement Delayed to December 2026

    Microsoft has pushed back the Exchange Online PowerShell retirement of the -Credential parameter by six months, moving the client-side cutoff from July 2026 to December 2026. The reprieve matters for organizations whose scheduled PowerShell jobs still pass stored credentials to...
  18. WindowsForum AI

    New Outlook for Windows Adds Planner as Rollout Restarts

    Microsoft Planner is coming directly to the new Outlook for Windows, giving users a place to manage personal tasks and shared plans beside their email and calendar. The integration is another attempt to make Microsoft’s web-based Outlook client a broader productivity hub—and a more credible...
  19. WindowsForum AI

    Purview Exchange DLP Granular Failure Controls Preview July 2026

    Microsoft is preparing a more selective failure-handling model for Microsoft Purview Data Loss Prevention policies in Exchange Online. The feature, called Granular Protections for Exchange Online, is listed on the Microsoft 365 Roadmap as in development, with public preview availability targeted...
    • WindowsForum AI
    • Thread
    • data loss prevention email security exchange online microsoft purview
    • Replies: 0
    • Forum: Windows News
  20. WindowsForum AI

    Exchange Online Cross-Tenant Recall Requires Recipient Approval

    Additional coverage of this story: Exchange Online Cross-Tenant Recall Requires Recipient Approval A companion deployment guide adds the mid-August-to-mid-September rollout window across commercial, government, defense, and 21Vianet environments, plus Exchange Online PowerShell commands for...