{"id":17416,"date":"2026-07-22T02:02:17","date_gmt":"2026-07-21T17:02:17","guid":{"rendered":"https:\/\/m365jp.net\/?p=17416"},"modified":"2026-07-22T02:03:48","modified_gmt":"2026-07-21T17:03:48","slug":"mc1287370-updated-auto-upgrade-of-shared-calendars-from-legacy-mapi-model-to-modern-rest-model-5","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-07-22-mc1287370-updated-auto-upgrade-of-shared-calendars-from-legacy-mapi-model-to-modern-rest-model-5","title":{"rendered":"MC1287370 | (Updated) Auto upgrade of shared calendars from legacy MAPI model to modern REST model"},"content":{"rendered":"
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MC1287370 | (Updated) Auto upgrade of shared calendars from legacy MAPI model to modern REST model<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n
Classification<\/th>\nplanForChange<\/td>\n<\/tr>\n
Last Updated<\/th>\n07\/21\/2026 16:23:41<\/td>\n<\/tr>\n
Start Time<\/th>\n04\/21\/2026 22:51:16<\/td>\n<\/tr>\n
End Time<\/th>\n10\/30\/2026 07:00:00<\/td>\n<\/tr>\n
Message Content<\/th>\n\n

Updated July 20, 2026: We have updated the timeline. Thank you for your patience.<\/p>\n

[Introduction]<\/strong><\/p>\n

Microsoft is introducing an automatic upgrade for shared calendars<\/strong> in Outlook and Exchange Online<\/em>, transitioning from the legacy MAPI-based model to the modern REST-based model<\/strong>. This server-side upgrade <\/strong>will improve calendar sync reliability, performance, and consistency for delegates and users who access shared calendars. The change is designed to be seamless and will not require any action from users or administrators.<\/p>\n

[When this will happen]<\/strong><\/p>\n

General Availability (Worldwide):<\/strong><\/p>\n

Till WW it is enabled and available to all WW tenants. Now we are expanding it to higher rings:<\/p>\n

GCC High \/DoD:<\/strong><\/p>\n

Rollout starting August 2026 (previously end of June) and completing by late September 2026 (previously late July)<\/p>\n

Note: Rollout will be progressive and timing may vary by tenant.<\/p>\n

[How this affects your organization]<\/strong><\/p>\n

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

    \n
  1. <\/span>Microsoft 365 tenants using Exchange Online<\/li>\n
  2. <\/span>Users who have Editor or higher permissions<\/strong> on shared calendars in user or shared mailboxes<\/em><\/li>\n
  3. <\/span>Delegates and users who access shared calendars in Outlook<\/em><\/li>\n<\/ol>\n

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

      \n
    1. <\/span>Shared calendars will be automatically upgraded<\/strong> from the legacy MAPI-based model to the modern REST-based model.<\/li>\n
    2. <\/span>A new calendar folder<\/strong> will be created in a hidden state<\/strong> and will only become visible to the user once the full sync is successfully completed and validated, ensuring a seamless rollover to the new model.<\/li>\n
    3. <\/span>The transition is expected to appear seamless, with no interruption to normal user workflows.<\/li>\n
    4. <\/span>Events older than one year <\/strong>will be excluded<\/strong> from the initial sync window. However, recurring events with instances falling within or after the one-year threshold will still be included in the sync.<\/li>\n
    5. <\/span>Existing permissions and sharing relationships<\/strong> will be preserved<\/strong>; no re-sharing or permission reset will be required.<\/li>\n
    6. <\/span>The upgrade process is fully automatic and requires no action from the user<\/strong> \u2014 no Outlook restart, profile recreation, or any other manual steps.<\/li>\n
    7. <\/span>No data loss<\/strong> is expected as a result of this change.<\/li>\n
    8. <\/span>The rollout will initially support auto-upgrade for up to four shared calendars<\/strong> per delegate or principal, scaling up to six over time. Those managing more than six shared calendars will be excluded from the auto-upgrade<\/strong> and will experience no change to their current setup.<\/li>\n<\/ol>\n

      How does it effect the Classic Outlook setting ‘Turn on shared calendar improvements’?<\/p>\n

        \n
      1. <\/span>After migration, Classic Outlook will continue to honour the existing setting. Although shared calendars are upgraded to the REST model at the service level, Classic Outlook will follow the setting and use MAPI-based model if the setting is turned off. This behaviour is limited to Classic Outlook; all other endpoints (Outlook Web, Mobile, Mac, New Outlook) will use REST.<\/li>\n<\/ol>\n

        [What you can do to prepare]<\/strong><\/p>\n

        No action is required.<\/p>\n

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

          \n
        1. <\/span>During migration, a hidden shared calendar folder may be visible to tenant admins and support teams via the Get-MailboxFolderStatistics cmdlet. This is expected and has no impact on end users.<\/li>\n
        2. <\/span>Monitor for persistent issues, such as missing meetings after the migration window or duplicate calendar folders, and contact Microsoft support if observed.<\/li>\n
        3. <\/span>If a manual rollback is required after the calendar becomes visible, open a support request through standard Microsoft support channels.<\/li>\n<\/ol>\n

          [Compliance considerations]<\/strong><\/p>\n

          No compliance considerations identified. Review as appropriate for your organization.<\/p>\n<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\n

2026\u5e747\u670820\u65e5\u66f4\u65b0:\u30bf\u30a4\u30e0\u30e9\u30a4\u30f3\u3092\u66f4\u65b0\u3057\u307e\u3057\u305f\u3002\u3054\u8f9b\u62b1\u3044\u305f\u3060\u304d\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3059\u3002<\/p>\n

[\u306f\u3058\u3081\u306b]<\/strong><\/p>\n

Microsoft\u306fOutlook\u3068Exchange Online<\/em>\u306e\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u306e\u81ea\u52d5\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9<\/strong>\u3092\u5c0e\u5165\u3057\u3001\u5f93\u6765\u306eMAPI\u30d9\u30fc\u30b9\u306e\u30e2\u30c7\u30eb\u304b\u3089\u6700\u65b0\u306eREST\u30d9\u30fc\u30b9\u306e\u30e2\u30c7\u30eb\u3078\u3068\u79fb\u884c\u3057\u3066\u3044\u307e\u3059<\/strong>\u3002\u3053\u306e\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9<\/strong>\u306b\u3088\u308a\u3001\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u30c7\u30ea\u30b2\u30fc\u30c8\u3084\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u3001\u30ab\u30ec\u30f3\u30c0\u30fc\u540c\u671f\u306e\u4fe1\u983c\u6027\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u4e00\u8cab\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002\u3053\u306e\u5909\u66f4\u306f\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u8a2d\u8a08\u3055\u308c\u3066\u304a\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u3084\u7ba1\u7406\u8005\u306e\u884c\u52d5\u306f\u4e0d\u8981\u3067\u3059\u3002<\/p>\n

[\u3044\u3064\u8d77\u3053\u308b\u304b]<\/strong><\/p>\n

\u4e00\u822c\u516c\u958b(\u4e16\u754c):<\/strong><\/p>\n

WW\u307e\u3067\u306f\u6709\u52b9\u3067\u3001\u3059\u3079\u3066\u306eWW\u30c6\u30ca\u30f3\u30c8\u304c\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002\u6b21\u306b\u3001\u3088\u308a\u9ad8\u3044\u74b0\u306b\u5c55\u958b\u3057\u3066\u3044\u307e\u3059:<\/p>\n

GCC\u30cf\u30a4\/DoD:<\/strong><\/p>\n

2026\u5e748\u6708\u304b\u3089(\u4ee5\u524d\u306f6\u6708\u672b)\u307e\u3067\u30012026\u5e749\u6708\u4e0b\u65ec(\u4ee5\u524d\u306f7\u6708\u4e0b\u65ec)\u307e\u3067\u306b\u5b8c\u4e86<\/p>\n

\u6ce8:\u5c55\u958b\u306f\u6bb5\u968e\u7684\u306b\u884c\u308f\u308c\u3001\u30c6\u30ca\u30f3\u30c8\u306b\u3088\u3063\u3066\u6642\u671f\u304c\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

[\u3053\u308c\u304c\u3042\u306a\u305f\u306e\u7d44\u7e54\u306b\u4e0e\u3048\u308b\u5f71\u97ff]<\/strong><\/p>\n

\u5f71\u97ff\u3092\u53d7\u3051\u308b\u4eba\u7269<\/em><\/p>\n

    \n
  1. <\/span>Exchange Online\u3092\u5229\u7528\u3059\u308bMicrosoft 365\u30c6\u30ca\u30f3\u30c8<\/li>\n
  2. <\/span>\u30e6\u30fc\u30b6\u30fc\u307e\u305f\u306f\u5171\u6709\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9<\/em>\u5185\u306e\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u306b\u30a8\u30c7\u30a3\u30bf\u30fc\u4ee5\u4e0a\u306e\u6a29\u9650<\/strong>\u3092\u6301\u3064\u30e6\u30fc\u30b6\u30fc<\/li>\n
  3. <\/span>Outlook<\/em>\u3067\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u30c7\u30ea\u30b2\u30fc\u30c8\u3084\u30e6\u30fc\u30b6\u30fc<\/li>\n<\/ol>\n

    \u4f55\u304c\u8d77\u3053\u308b\u306e\u304b<\/em><\/p>\n

      \n
    1. <\/span>\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u306f\u3001\u5f93\u6765\u306eMAPI\u30d9\u30fc\u30b9\u306e\u30e2\u30c7\u30eb\u304b\u3089\u6700\u65b0\u306eREST\u30d9\u30fc\u30b9\u306e\u30e2\u30c7\u30eb\u3078 \u81ea\u52d5\u7684\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9<\/strong> \u3055\u308c\u307e\u3059\u3002<\/li>\n
    2. <\/span>\u65b0\u3057\u3044\u30ab\u30ec\u30f3\u30c0\u30fc\u30d5\u30a9\u30eb\u30c0<\/strong>\u306f\u96a0\u308c\u305f\u72b6\u614b\u3067<\/strong>\u4f5c\u6210\u3055\u308c\u3001\u5b8c\u5168\u306a\u540c\u671f\u304c\u6b63\u5e38\u306b\u5b8c\u4e86\u3057\u691c\u8a3c\u3055\u308c\u305f\u5834\u5408\u306b\u306e\u307f\u30e6\u30fc\u30b6\u30fc\u306b\u8868\u793a\u3055\u308c\u3001\u65b0\u3057\u3044\u30e2\u30c7\u30eb\u3078\u306e\u30b7\u30fc\u30e0\u30ec\u30b9\u306a\u30ed\u30fc\u30eb\u30aa\u30fc\u30d0\u30fc\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/li>\n
    3. <\/span>\u79fb\u884c\u306f\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u898b\u3089\u308c\u3001\u901a\u5e38\u306e\u30e6\u30fc\u30b6\u30fc\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306b\u652f\u969c\u304c\u51fa\u306a\u3044\u3068\u671f\u5f85\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n
    4. <\/span>1\u5e74\u4ee5\u4e0a\u524d\u306e\u30a4\u30d9\u30f3\u30c8\u306f <\/strong>\u521d\u671f\u540c\u671f\u30a6\u30a3\u30f3\u30c9\u30a6\u304b\u3089 \u9664\u5916<\/strong> \u3055\u308c\u307e\u3059\u3002\u305f\u3060\u3057\u30011\u5e74\u4ee5\u5185\u306e\u307e\u305f\u306f\u305d\u308c\u4ee5\u964d\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u7e70\u308a\u8fd4\u3057\u30a4\u30d9\u30f3\u30c8\u306f\u540c\u671f\u306b\u542b\u307e\u308c\u307e\u3059\u3002<\/li>\n
    5. <\/span>\u65e2\u5b58\u306e\u6a29\u9650\u3068\u5171\u6709\u95a2\u4fc2\u306f<\/strong>\u4fdd\u6301<\/strong>\u3055\u308c\u307e\u3059\u3002\u518d\u5171\u6709\u3084\u8a31\u53ef\u306e\u30ea\u30bb\u30c3\u30c8\u306f\u4e0d\u8981\u3067\u3059\u3002<\/li>\n
    6. <\/span>\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u30d7\u30ed\u30bb\u30b9\u306f\u5b8c\u5168\u306b\u81ea\u52d5\u3067\u3001 \u30e6\u30fc\u30b6\u30fc\u306e\u64cd\u4f5c\u306f\u4e00\u5207\u5fc5\u8981<\/strong> \u3042\u308a\u307e\u305b\u3093\u3002Outlook\u306e\u518d\u8d77\u52d5\u3084\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u306e\u4f5c\u6210\u3001\u305d\u306e\u4ed6\u306e\u624b\u52d5\u64cd\u4f5c\u3082\u4e0d\u8981\u3067\u3059\u3002<\/li>\n
    7. <\/span>\u3053\u306e\u5909\u66f4\u306b\u3088\u308b\u30c7\u30fc\u30bf\u640d\u5931\u306f\u4e88\u60f3\u3055\u308c\u3066\u3044\u307e\u305b\u3093<\/strong>\u3002<\/li>\n
    8. <\/span>\u3053\u306e\u5c55\u958b\u3067\u306f\u3001\u5f53\u521d\u306f\u4ee3\u8868\u8005\u307e\u305f\u306f\u30d7\u30ea\u30f3\u30b7\u30d1\u30eb\u3042\u305f\u308a \u6700\u59274\u3064\u306e\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u306e\u81ea\u52d5\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057<\/strong> \u3001\u6642\u9593\u3068\u3068\u3082\u306b\u6700\u59276\u3064\u307e\u3067\u62e1\u5927\u3055\u308c\u307e\u3059\u3002 6\u3064\u4ee5\u4e0a\u306e\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u7ba1\u7406\u3059\u308b\u4eba\u306f\u81ea\u52d5\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u304b\u3089\u9664\u5916<\/strong> \u3055\u308c\u3001\u73fe\u5728\u306e\u8a2d\u5b9a\u306b\u5909\u66f4\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<\/ol>\n

      \u30af\u30e9\u30b7\u30c3\u30af\u306aOutlook\u306e\u8a2d\u5b9a\u300c\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u6539\u5584\u3092\u6709\u52b9\u306b\u3059\u308b\u300d\u306b\u3069\u3046\u5f71\u97ff\u3057\u307e\u3059\u304b?<\/p>\n

        \n
      1. <\/span>\u79fb\u884c\u5f8c\u3082Classic Outlook\u306f\u65e2\u5b58\u306e\u8a2d\u5b9a\u3092\u5f15\u304d\u7d9a\u304d\u5c0a\u91cd\u3057\u307e\u3059\u3002\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u306f\u30b5\u30fc\u30d3\u30b9\u30ec\u30d9\u30eb\u3067REST\u30e2\u30c7\u30eb\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3055\u308c\u307e\u3059\u304c\u3001Classic Outlook\u306f\u8a2d\u5b9a\u3092\u5b88\u308a\u3001\u8a2d\u5b9a\u304c\u30aa\u30d5\u306b\u3055\u308c\u3066\u3044\u308c\u3070MAPI\u30d9\u30fc\u30b9\u306e\u30e2\u30c7\u30eb\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u306e\u6319\u52d5\u306f\u30af\u30e9\u30b7\u30c3\u30af\u30fb\u30a2\u30a6\u30c8\u30eb\u30c3\u30af\u306b\u9650\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u4ed6\u306e\u3059\u3079\u3066\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8(Outlook Web\u3001\u30e2\u30d0\u30a4\u30eb\u3001Mac\u3001\u65b0\u3057\u3044Outlook)\u306fREST\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n

        \u3010\u6e96\u5099\u306e\u305f\u3081\u306b\u3067\u304d\u308b\u3053\u3068\u3011<\/strong><\/p>\n

        \u4f55\u306e\u5bfe\u5fdc\u3082\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n

        \u79c1\u305f\u3061\u306f\u7ba1\u7406\u8005\u306b\u4ee5\u4e0b\u306e\u3053\u3068\u3092\u63a8\u5968\u3057\u307e\u3059:<\/p>\n

          \n
        1. <\/span>\u79fb\u884c\u6642\u306b\u306f\u3001Get-MailboxFolderStatistics\u30b3\u30de\u30f3\u30c9\u30ec\u30c3\u30c8\u3092\u901a\u3058\u3066\u30c6\u30ca\u30f3\u30c8\u7ba1\u7406\u8005\u3084\u30b5\u30dd\u30fc\u30c8\u30c1\u30fc\u30e0\u306b\u96a0\u3055\u308c\u305f\u5171\u6709\u30ab\u30ec\u30f3\u30c0\u30fc\u30d5\u30a9\u30eb\u30c0\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u4e88\u60f3\u3055\u308c\u308b\u3053\u3068\u3067\u3042\u308a\u3001\u30a8\u30f3\u30c9\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u5f71\u97ff\u3057\u307e\u305b\u3093\u3002<\/li>\n
        2. <\/span>\u79fb\u884c\u671f\u9593\u4ee5\u964d\u306e\u4f1a\u8b70\u306e\u6b20\u5982\u3084\u30ab\u30ec\u30f3\u30c0\u30fc\u30d5\u30a9\u30eb\u30c0\u306e\u91cd\u8907\u306a\u3069\u3001\u6301\u7d9a\u7684\u306a\u554f\u984c\u3092\u76e3\u8996\u3057\u3001\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306fMicrosoft\u30b5\u30dd\u30fc\u30c8\u306b\u9023\u7d61\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n
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          MC1287370 | (Updated) Auto upgrade of shared calendars from legacy MAPI model to modern REST model Classificat […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-17416","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/17416","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/comments?post=17416"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/17416\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=17416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=17416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=17416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}