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Exchange mailboxes overcommitment

Tankwell 136 Reputation points
2021-09-14T08:16:47.17+00:00

Hey all

I wanted to ask If there such a thing overcommitment in Exchange mailbox databases, and I will explain -

Lets suppose I have 3 users with 5GB quota configured, and they all share a database with capacity of 10GB
What will happen when the combined volume will reach the 10GB limit?

  • Will they get a warning?
  • Is the mailbox database is going to grow automatically? (e.g the edb file will just try to grow?)

Thanks
Tankwell

Exchange | Exchange Server | Management
Exchange | Exchange Server | Management

The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.

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Answer accepted by question author

Andy David - MVP 160.3K Reputation points MVP Volunteer Moderator
2021-09-14T12:03:31.403+00:00

The edb file will grow as much as needed until disk space is exhausted.

Users will NOT get a warning unless they reach their mailbox quotas, that is up to you to monitor disk space.

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  1. Joyce Shen - MSFT 16,706 Reputation points
    2021-09-15T02:54:30.75+00:00

    Hi @Tankwell

    Yes, agree with Andy.

    Users will get the warning notification only when their mailbox size reaches or exceeds the value of Issue a warning at (GB) specified, Exchange sends a warning message to the user.

    Official document here: Configure storage quotas for a mailbox in Exchange Server
    This can also be configured at database side: Manage mailbox databases in Exchange Server


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