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What is the max emails in the 0365 outlook inbox

Leo Faucher 0 Reputation points
2026-03-10T20:33:32.28+00:00

Does the )365 outlook inbox have a max emial files limit?

Outlook | Windows | New Outlook for Windows | For business

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  1. Ryan-N 13,335 Reputation points Microsoft External Staff Moderator
    2026-03-10T20:48:58.4033333+00:00

    Hi @Leo Faucher,

    Thank you for posting your question in the Microsoft Q&A forum.

    I would like to provide you with the following information:

    Outlook 365 does not limit the number of emails; however, it does have a storage limit.

    To check your remaining storage, please follow these steps:

    Select Settings > Account > Storage

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    I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.

    Thank you for your patience and your understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.

    I look forward to continuing the conversation.

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  2. AI answer

    2026-03-10T20:33:50.7366667+00:00

    Exchange Online mailboxes in Microsoft 365 do not have a practical hard limit on the number of emails in the Inbox specifically; instead, limits are based on:

    1. Total mailbox size
      For most business plans, the primary mailbox size is up to 100 GB (and more via archive, depending on plan). Once the mailbox reaches its size quota, capacity alerts are triggered:
      • Warning: user is notified the mailbox is approaching the limit.
      • Prohibit Send: user cannot send new messages.
      • Prohibit Send/Receive: user cannot send or receive messages until space is freed.
    2. Mailbox folder limits (items per folder)
      Exchange Online enforces limits per folder to keep performance stable:
      • There is a maximum number of messages per mailbox folder; when this is reached, new messages cannot be delivered or saved in that folder.
      • A warning threshold exists for number of messages per folder; when reached, a warning is sent once a day.
      • There are also limits on maximum number of subfolders per mailbox folder (10,000) and maximum folder hierarchy depth (300 levels).

    In practice, the Inbox can hold a very large number of items, constrained by the overall mailbox size and these folder limits, not by a simple “max emails in Inbox” count.

    References:

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

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