how do I increase mailbox size to more than 50GB

Wissam Khalid 0 Reputation points
2026-02-08T11:43:12.7466667+00:00

how do I increase mailbox size to more than 50GB? I have microsoft 365 basic subscription

Exchange | Exchange Server | Other
Exchange | Exchange Server | Other

A robust email, calendaring, and collaboration platform developed by Microsoft, designed for enterprise-level communication and data management.Miscellaneous topics that do not fit into specific categories.

0 comments

2 answers

Sort by: Most helpful
Most helpful Newest Oldest

  1. AI answer

    2026-02-08T11:43:20.23+00:00

    To increase the mailbox size to more than 50GB in Microsoft 365, you will need to assign a different subscription license to the user. The size of an Exchange Online mailbox is determined by the subscription license associated with it. The Microsoft 365 Basic subscription typically allows for a maximum mailbox size of 50GB.

    To increase the mailbox size:

    1. As a Microsoft 365 administrator, you can change the user's subscription to a plan that offers a larger mailbox size.
    2. For more information about mailbox size limits for different types of licenses, refer to the Mailbox Storage Limits documentation.

    Please note that this feature requires a Microsoft 365 administrator account and is not available for certain Microsoft 365 plans.

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

    Was this answer helpful?

    1 person found this answer helpful.
  2. Pavle Peković 6,410 Reputation points Volunteer Moderator
    2026-02-08T12:32:43.1533333+00:00

    There are two options.

    Option 1 is to switch to plan with 100GB Mailbox (E3, E5 or Exchange Online plan 2). But they are much more expensive.

    Option 2 is to have Exchange Online Archiving add-on. https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-archiving-service-description/exchange-online-archiving-service-description

    Was this answer helpful?

    0 comments

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.