How To Increase Mailbox Size In Office 365 Admin

Update: This post was updated on October 8, 2021 due to new archiving limits

Microsoft 365 (or to be more precise, Exchange Online) has sure mailbox size limits. Those limits depend on two variables: the subscription plan assigned to the mailbox and the mailbox type. This commodity shows what the maximum mailbox size is, how to increment mailbox size, how to check the current mailbox usage for all mailboxes and what to practice to prevent mailboxes from reaching their size limit. You may find it useful if you're planning to migrate from on-bounds Exchange Server to Microsoft 365.

Mailbox size in Microsoft 365 (Office 365)

Max mailbox size in Microsoft 365

The maximum mailbox size for almost mailboxes is 50 GB. At that place are some exceptions, though:

User mailboxes' size limit can be increased upward to 100 GB if assigned a Microsoft 365 E3 or E5 license (Exchange Online Program 2). An F3 (Kiosk) license includes only 2 GB of storage and it doesn't provide annal mailboxes.
Public folder mailboxes (in all subscription plans) have a limit of 100 GB.
Shared mailboxes don't require whatsoever license and have the standard, 50 GB size limit. All the same, when assigned an E3 or E5 license, they can store up to 100 GB of information.
User and shared mailboxes' storage space tin can be extended past an annal mailbox (In-Place Annal). Once the archiving feature is enabled, an annal mailbox is assigned to each mailbox separately. Past default, an archive mailbox has the 50 GB storage limit, only there is an option to have nearly unlimited (automatically expanding) archiving infinite* thanks to an Exchange Online Plan ii license, or an Substitution Online Plan 1 license with an Commutation Online Archiving improver license. To enable archiving for a shared mailbox, either of the mentioned license types needs to be assigned.

* since November 1, 2021, Microsoft introduces limits for auto-expanding athenaeum: max size of 1.5TB total and max growth charge per unit of 1 GB per day. The word unlimited is now removed from their documentation. This information is based on MC288051 from the Microsoft 365 message center. It'southward all the same a lot of space, considering it's reserved for a single user. It's not permitted to use journaling, transport rules or auto-forwarding for other mailboxes' backup or archiving purposes.

Increase mailbox size in Microsoft 365

There are two ways to increase the max mailbox size for a user:

Assign an Exchange Online Plan 2 license to the mailbox. This will increase the mailbox storage limit from 50 GB to 100 GB.
Enable Substitution Online Archiving. Depending on your Microsoft 365 license, this will either give you additional 50 GB of space or nearly unlimited space with the motorcar-expanding archiving feature.

Increasing the maximum quota is not the simply mode to make more infinite available in mailboxes. It'due south similar with your standard hard drives – y'all can either go a new, larger one, or free up some of the used infinite. Commutation Online allows you to utilise retention policies to either retain or delete data automatically, based on the criteria you specify.

At that place are also three^rd party fill-in & archiving tools, like CodeTwo Backup for Office 365, which let you subtract the amount of information kept in the cloud. This way, you can retain data discoverability while preventing mailboxes from overloading.

Archiving in Microsoft 365

Annal mailboxes are fastened to other mailboxes. Data stored in an archive mailbox is accessible and searchable by the user. For users to be able to access the shared mailbox's In-Place Archive, they need to exist assigned explicit FullAccess permissions to the shared mailbox. All the archived data can also exist found with eDiscovery. Information technology'due south of import to know that mailbox items from the primary mailbox exercise not menses automatically to the archives.

There are two ways to move such items to the archive mailbox – by either setting upwardly an archiving policy or moving the items manually. An archiving policy is a type of retention policy. Retention policies can be gear up according to your arrangement's needs to command your information. Mailbox items are assigned specific retention tags, according to which the oldest items are automatically moved to annal mailboxes or deleted.

As you probably know, litigation holds and retention policies allow your company to access information even later information technology has been purged from user or shared mailboxes. For instance, emails deleted from the Deleted Items folder are moved to the Recoverable Items folder, which has its own quota. The Recoverable Items folder doesn't count towards the chief mailbox limits.

Read more near retentivity policies and litigation holds

What is unlimited archiving?

Since November one, 2021, unlimited archiving is no longer available in Microsoft 365. Now, the feature goes past its 2nd name simply: auto-expanding archiving. Currently, the limits for an auto-expanding annal are as follows:

1.5 TB total size,
1 GB max daily growth charge per unit.

While those numbers are far from being "unlimited" it is a large quota for a single user. The second limit probably acts as a manner to forbid the utilize of journaling and auto-forwarding since archiving is intended just for that user. If a mailbox is getting almost the max archive limit, you will need to either articulate some of its contents or use a third-party archiving solution. Car-expanding archiving is available for mailboxes using Exchange Online Programme ii or Exchange Online Plan 1 with an Exchange Online Archiving add-on license. It needs to be enabled, only similar standard annal mailboxes. While this option gives users archives with a generous size limit, it doesn't hateful that they should stop cleaning upward their mailboxes. Storage of 1.v TB sounds fun until a user needs to discover a specific email.

How to check mailbox size in Microsoft 365

Now, of class, yous can utilize the Exchange admin center to check mailbox usage of a sure person:

Just if you want to check mailbox size for all mailboxes (including Shared mailboxes and resources mailboxes), it is far easier to employ PowerShell:

First, Connect to Substitution Online via PowerShell.

Then, you tin download the current mailbox information into a variable, using the following cmdlet:

$exomailboxsize = (Get-EXOMailbox | Get-EXOMailboxStatistics)

Afterwards, you tin can, for example, sort the mailboxes co-ordinate to their size:

$exomailboxsize | select DisplayName, TotalItemSize | sort -Belongings TotalItemSize -Descending

And if there are any mailboxes nearing their maximum size, y'all tin can take some steps to increase their limits or free up some of the infinite.

Enable archive mailboxes

Y'all tin enable archive mailboxes using the Exchange admin center:

Or via PowerShell.

To enable archive mailbox for a specific user or shared mailbox, apply the following cmdlet:

Enable-Mailbox -Identity mailbox -Archive

You can easily check which mailboxes already have the archiving feature enabled by using:

Become-Mailbox -Archive

And to turn on auto-expanding archiving, utilise the following command:

Enable-Mailbox -Identity user -AutoExpandingArchive

How to drift from Commutation Server to Microsoft 365
Bulletin tracking in Microsoft 365
Archive vs backup – learn the differences

How To Increase Mailbox Size In Office 365 Admin,

Source: https://www.codetwo.com/admins-blog/mailbox-size-microsoft-365/#:~:text=Increase%20mailbox%20size%20in%20Microsoft,Enable%20Exchange%20Online%20Archiving.

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