{"id":18553,"date":"2026-09-16T09:02:03","date_gmt":"2026-09-16T00:02:03","guid":{"rendered":"https:\/\/m365jp.net\/?p=18553"},"modified":"2026-09-16T09:06:51","modified_gmt":"2026-09-16T00:06:51","slug":"mc1472592-microsoft-purview-auto-expanding-archive-capacity-increases-to-3-tb-for-eligible-mailboxes","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-09-16-mc1472592-microsoft-purview-auto-expanding-archive-capacity-increases-to-3-tb-for-eligible-mailboxes","title":{"rendered":"MC1472592 | Microsoft Purview: Auto-expanding archive capacity increases to 3 TB for eligible mailboxes"},"content":{"rendered":"
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MC1472592 | Microsoft Purview: Auto-expanding archive capacity increases to 3 TB for eligible mailboxes<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
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Classification<\/th>\nstayInformed<\/td>\n<\/tr>\n
Last Updated<\/th>\n09\/15\/2026 23:02:40<\/td>\n<\/tr>\n
Start Time<\/th>\n09\/15\/2026 23:01:26<\/td>\n<\/tr>\n
End Time<\/th>\n11\/22\/2026 08:00:00<\/td>\n<\/tr>\n
Message Content<\/th>\n\n

[What and why]<\/b><\/p>\n

Microsoft Purview Data Lifecycle Management is increasing the maximum auto-expanding archive capacity for eligible Exchange Online archive mailboxes from 1.5 TB to 3 TB. This enhancement helps organizations retain and manage larger volumes of archived email content without requiring manual archive expansion processes or support requests. Eligible mailboxes with auto-expanding archiving enabled will continue to grow automatically as needed.<\/p>\n

[Rollout schedule]<\/b><\/p>\n

    \n
  • General Availability (Worldwide):<\/b> Beginning in mid-October 2026<\/b> and expected to complete by late October 2026<\/b><\/li>\n<\/ul>\n

    [Impact on your organization]<\/b><\/p>\n

    Who is affected<\/em><\/p>\n

      \n
    • Organizations using Exchange Online archive mailboxes with auto-expanding archiving enabled<\/li>\n
    • Administrators responsible for Microsoft Purview Data Lifecycle Management and Exchange Online archiving<\/li>\n
    • Users assigned eligible licenses that support the increased archive capacity<\/li>\n<\/ul>\n

      Platforms and services<\/em><\/p>\n

        \n
      • Microsoft Purview Data Lifecycle Management<\/li>\n
      • Exchange Online<\/li>\n
      • Exchange Online Archiving<\/li>\n<\/ul>\n

        What will happen<\/em><\/p>\n

          \n
        • Eligible archive mailboxes with auto-expanding archiving enabled can automatically expand beyond the current 1.5 TB limit up to a maximum of 3 TB per mailbox.<\/li>\n
        • No additional configuration is required for eligible mailboxes that already have auto-expanding archiving enabled.<\/li>\n
        • No per-GB consumption charge is introduced as part of this change.<\/li>\n
        • Existing archive content, retention configurations, policies, and holds are unchanged.<\/li>\n
        • No new administrator workflow, user experience, or user interface is introduced.<\/li>\n
        • Mailboxes that do not have an eligible license will continue to be limited to 1.5 TB.<\/li>\n<\/ul>\n

          Eligible licensing includes:<\/p>\n

            \n
          • Office 365 E5, A5, and G5<\/li>\n
          • Microsoft 365 E5, A5, and G5<\/li>\n
          • Microsoft 365 Purview Suite<\/li>\n
          • Microsoft 365 Purview Suite FLW, EDU, and GOV<\/li>\n
          • Microsoft Defender + Purview Suite FLW<\/li>\n
          • Microsoft 365 F5 Compliance<\/li>\n
          • Microsoft 365 F5 Security + Compliance<\/li>\n
          • Combination of the eDiscovery & Audit and Insider Risk Management mini suites together with the Information Protection & Governance mini suite<\/li>\n<\/ul>\n

            Note:<\/b> The maximum auto-expanding archive capacity supported through this feature is 3 TB per mailbox for eligible licenses.<\/p>\n

            [Action required and recommendations]<\/b><\/p>\n

            No action is required if eligible mailboxes already have auto-expanding archiving enabled.<\/p>\n

            We recommend that administrators:<\/p>\n

Machine Translation<\/th>\n\n

[\u4f55\u3068\u306a\u305c]<\/b><\/p>\n

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[\u5c55\u958b\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb]<\/b><\/p>\n