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Tankwell-6822 avatar image
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Tankwell-6822 asked Tankwell-6822 commented

Exchange mailboxes overcommitment

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

office-exchange-server-administration
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AndyDavid avatar image
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AndyDavid answered

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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joyceshen-MSFT avatar image
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joyceshen-MSFT answered Tankwell-6822 commented

Hi @Tankwell-6822

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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Hey,

Thank you
The documentation did not actually specify what happen when the .edb file needs to grow...
So the consequence is that over commitment in the database (means - give the users more capacity than the database can afford)

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