How to fix KUtools not showing up in NEW outlook but seems ok in OLD Outlook

Ken Warner 0 Reputation points
2026-11-09T16:41:44.13+00:00

My objective is to automatically reply to SOME emails in NEW Outlook and to that end I have installed KUTools. It shows up in OLD Outlook and even seems to work but not in NEW Outlook. Can you help?

Outlook | Windows | New Outlook for Windows | For home
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  1. AI answer

    2026-11-09T16:42:06.7133333+00:00

    KUTools appearing in classic Outlook but not in new Outlook is consistent with how add-ins work in new Outlook.

    For new Outlook, supported add-ins are installed from More apps > Add apps. If KUTools is not available there, or if it was installed only into classic Outlook, it will not appear automatically in new Outlook.

    What can be done:

    1. In new Outlook, open More apps > Add apps.
    2. Search for the add-in there.
    3. If the add-in is available, select it and choose Add.
    4. If KUTools is not listed, check whether the vendor provides a custom Outlook add-in file for web/new Outlook.
    5. If a custom add-in file is available, install it through Outlook on the web using My add-ins > Add a custom add-in > Add from file.

    Important limitations from the current Outlook behavior:

    • New Outlook uses its own add-in model and does not automatically use classic Outlook add-ins.
    • Installing a custom add-in from a URL is not supported; only Add from file is available as the workaround.
    • If the goal is automatic replies, new Outlook already includes Automatic replies at View > View settings > Accounts > Automatic Replies.
    • Automatic replies are not supported for Gmail, Yahoo, or other POP/IMAP accounts in new Outlook.

    If the mailbox is a Microsoft 365 or Exchange account, the built-in Automatic Replies feature is the supported option in new Outlook. If the account is Gmail, Yahoo, POP, or IMAP, that built-in feature will not be available in new Outlook.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. Emma1-N 14,925 Reputation points Microsoft External Staff Moderator
    2026-11-10T03:24:20.27+00:00

    Welcome Ken Warner,

    Thanks for reaching out to Microsoft Q&A Forum. I understand that KUTools shows up and works in classic Outlook but doesn't appear in new Outlook, and you want to automatically reply to only some of your emails.

    To narrow this down, could you share:

    • What type of email account do you use in Outlook (for example Outlook.com/Hotmail, Gmail, or another provider)?
    • Which emails should get the automatic reply? For example, are they from specific senders, or do they have certain words in the subject?

    Please make sure you already tried the Q&A Assist steps. In addition, please try the following:

    1, Run classic Outlook and new Outlook side by side, so KUTools keeps handling auto-replies in classic Outlook while you use new Outlook for everything else.

    • Open Start, type Outlook, right-click Outlook (classic) and select Pin to taskbar.
    • Do the same for Outlook (new).
    • Keep classic Outlook open whenever you need the KUTools auto-reply to run.
    • Guide: Run new Outlook and classic Outlook side-by-side

    2, If classic Outlook keeps redirecting you to new Outlook, select the toggle at the top right of new Outlook and choose Switch back to classic Outlook. If you only need classic Outlook once, choose Use classic Outlook this time.

    3, As an alternative to KUTools, set up a rule in classic Outlook that replies with a template to selected emails only.

    • Create a new email with your reply text, then go to File > Save As and choose Outlook Template.
    • Go to Home > Rules > Manage Rules & Alerts > New Rule > Apply rule on messages I receive.
    • Choose your conditions (for example from people or public group, or with specific words in the subject).
    • Under actions, select reply using a specific template and browse to the template you saved.
    • This rule runs only while classic Outlook is open.

    Looking forward to your update.

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