{"id":15882,"date":"2026-04-14T02:01:02","date_gmt":"2026-04-13T17:01:02","guid":{"rendered":"https:\/\/m365jp.net\/?p=15882"},"modified":"2026-04-14T02:01:31","modified_gmt":"2026-04-13T17:01:31","slug":"mc1278920-support-for-office-ltsc-2021-and-additional-apps-will-end-on-october-13-2026","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-14-mc1278920-support-for-office-ltsc-2021-and-additional-apps-will-end-on-october-13-2026","title":{"rendered":"MC1278920 | Support for Office LTSC 2021, and additional apps will end on October 13, 2026"},"content":{"rendered":"
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MC1278920 | Support for Office LTSC 2021, and additional apps will end on October 13, 2026<\/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>\n04\/13\/2026 16:19:55<\/td>\n<\/tr>\n
Start Time<\/th>\n04\/13\/2026 16:19:39<\/td>\n<\/tr>\n
End Time<\/th>\n04\/13\/2027 07:00:00<\/td>\n<\/tr>\n
Message Content<\/th>\n\n

As previously communicated<\/a>, support for Office LTSC 2021 will end on October 13, 2026. After that date, no further updates, security fixes, or technical support will be available for this version of Office. While the applications may continue to function, using unsupported software could lead to potential security risks, compliance risks, system incompatibilities, and other issues.<\/p>\n

Support for Visio LTSC 2021 and Microsoft Project LTSC 2021 and several other products<\/a> will also end on October 13, 2026. Organizations using these products should upgrade as soon as possible to maintain security, compliance, and performance.<\/p>\n

[How this will affect your organization:]<\/p>\n

After end of support, Office LTSC 2021 suites and standalones will no longer receive security updates or other fixes, and no technical assistance will be available for devices still running them. Continuing to use unsupported software can expose your organization to security and compliance risks and may impact service reliability and performance.<\/p>\n

[What you need to do to prepare:] <\/p>\n

To mitigate these risks while maintaining access to desktop Office apps, we recommend upgrading devices to a Microsoft 365 or Office 365 suite that includes Microsoft 365 Apps (for enterprise or for business). Microsoft 365 Apps provides always-up-to-date versions of familiar apps like Word, Excel, and PowerPoint for desktop, mobile, and web with continuous support under the Modern Lifecycle Policy<\/a> and is eligible for use with the Microsoft 365 Copilot add-on.<\/p>\n

Machine Translation<\/th>\n\n

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Visio LTSC 2021\u304a\u3088\u3073Microsoft Project LTSC 2021\u304a\u3088\u3073 \u305d\u306e\u4ed6\u3044\u304f\u3064\u304b\u306e\u88fd\u54c1\u306e<\/a> \u30b5\u30dd\u30fc\u30c8\u30822026\u5e7410\u670813\u65e5\u306b\u7d42\u4e86\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u88fd\u54c1\u3092\u4f7f\u7528\u3059\u308b\u7d44\u7e54\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3001\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u3067\u304d\u308b\u3060\u3051\u65e9\u304f\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3059\u3079\u304d\u3067\u3059\u3002<\/p>\n

[\u3053\u308c\u304c\u3042\u306a\u305f\u306e\u7d44\u7e54\u306b\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u304b:]<\/p>\n

\u30b5\u30dd\u30fc\u30c8\u7d42\u4e86\u5f8c\u3001Office LTSC 2021\u30b9\u30a4\u30fc\u30c8\u304a\u3088\u3073\u30b9\u30bf\u30f3\u30c9\u30a2\u30ed\u30f3\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3084\u305d\u306e\u4ed6\u306e\u4fee\u6b63\u3092\u53d7\u3051\u3089\u308c\u305a\u3001\u307e\u3060\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30c7\u30d0\u30a4\u30b9\u306b\u306f\u6280\u8853\u652f\u63f4\u3082\u63d0\u4f9b\u3055\u308c\u307e\u305b\u3093\u3002\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u4f7f\u3044\u7d9a\u3051\u308b\u3053\u3068\u306f\u3001\u7d44\u7e54\u3092\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3084\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u306e\u30ea\u30b9\u30af\u306b\u3055\u3089\u3057\u3001\u30b5\u30fc\u30d3\u30b9\u306e\u4fe1\u983c\u6027\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

[\u6e96\u5099\u306e\u305f\u3081\u306b\u3084\u308b\u3079\u304d\u3053\u3068:]<\/p>\n

\u3053\u308c\u3089\u306e\u30ea\u30b9\u30af\u3092\u8efd\u6e1b\u3057\u3064\u3064\u3001\u30c7\u30b9\u30af\u30c8\u30c3\u30d7Office\u30a2\u30d7\u30ea\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u3001Microsoft 365\u307e\u305f\u306fMicrosoft 365 Apps\u3092\u542b\u3080Office 365\u30b9\u30a4\u30fc\u30c8(\u4f01\u696d\u5411\u3051\u307e\u305f\u306f\u30d3\u30b8\u30cd\u30b9\u5411\u3051)\u3078\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3092\u63a8\u5968\u3057\u307e\u3059\u3002Microsoft 365 Apps\u306f\u3001Word\u3001Excel\u3001PowerPoint\u306a\u3069\u306e\u99b4\u67d3\u307f\u306e\u3042\u308b\u30a2\u30d7\u30ea\u306e\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u3001\u30e2\u30d0\u30a4\u30eb\u3001\u30a6\u30a7\u30d6\u5411\u3051\u306b\u63d0\u4f9b\u3057\u3001 \u30e2\u30c0\u30f3\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30dd\u30ea\u30b7\u30fc<\/a> \u306e\u4e0b\u3067\u7d99\u7d9a\u7684\u306b\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u3002Microsoft 365 Copilot\u30a2\u30c9\u30aa\u30f3\u3067\u306e\u5229\u7528\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n