O365 email box folder limits

PowerShell command.

Example box – Something@something.com (don’t include domain @something.com)

Get-MailboxFolderStatistics -Identity Something

Feature Office 365 Business Essentials Office 365 Business Premium Office 365 Education Office 365 Enterprise E1 Office 365 Enterprise E3 Office 365 Enterprise E5 Office 365 Enterprise K1
Maximum number of messages per mailbox folder 1 million 1 million 1 million 1 million 1 million 1 million 1 million
Warning for number of messages per mailbox folder 900,000 900,000 900,000 900,000 900,000 900,000 900,000
Maximum number of messages per folder in the Recoverable Items folder 3 million 3 million 3 million 3 million 3 million 3 million 3 million
Storage quota for Recoverable Items folder in primary mailbox (not on hold) 30 GB 30 GB 30 GB 30 GB 30 GB 30 GB 30 GB
Storage quota for Recoverable Items folder in primary mailbox (on hold) 100 GB 100 GB 100 GB 100 GB 100 GB 100 GB 100 GB
Storage quota for Recoverable Items folder in archive mailbox (not on hold) 30 GB 30 GB Unlimited2 30 GB Unlimited2 Unlimited2 30 GB
Storage quota for Recoverable Items folder in archive mailbox (on hold) 100 GB1 100 GB1 Unlimited2 100 GB1 Unlimited2 Unlimited2 100 GB1
Warning for number of messages per folder in the Recoverable Items folder 2.75 million 2.75 million 2.75 million 2.75 million 2.75 million 2.75 million 2.75 million
Maximum number of subfolders per mailbox folder 10,000 10,000 10,000 10,000 10,000 10,000 10,000
Warning for number of subfolders per mailbox folder 9000 9000 9000 9000 9000 9000 9000
Maximum folder hierarchy depth 300 300 300 300 300 300 300
Warning for folder hierarchy depth 250 250 250 250 250 250 250
Maximum number of public folders 100,000 100,000 100,000 100,000 100,000 100,000 Not available
Maximum number of subfolders per public folder 10,000 10,000 10,000 10,000 10,000 10,000 Not available
Warning for number of subfolders per public folder 9000 9000 9000 9000 9000 9000 Not available

1 This is the storage quota for the Recoverable Items folder, not the quota for the entire archive mailbox. The storage quota for the archive mailbox is unlimited for users with an Exchange Online (Plan 2) license or for users who have both an Exchange Online Plan 1 and an Exchange Online Archiving license. For information about increasing the Recoverable Items quota, see Increase the Recoverable Items quota for mailboxes on hold.
2 The initial storage quota for the Recoverable Items folder in an archive mailbox is 100 GB. When auto-expanding archiving is turned on, additional storage is automatically added when the storage capacity for the Recoverable Items folder is reached. For more information, see Overview of unlimited archiving in Office 365. See the Office 365 Roadmap for details about availability of auto-expanding archiving.

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