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Office 365 Email Account Limitations

Office 365 Limitations- posted 4/2018

 

Storage limits Office 365 

 

Feature 

Office 365 Enterprise E3 

User mailboxes 

100 GB 

Archive mailboxes7, 8 

100 GB - Unlimited 

Each user initially receives 100 GB of storage in the archive mailbox. When auto-expanding archiving is turned on, additional storage is automatically added when the 100 GB storage capacity is reached. 

Shared mailboxes 

50 GB2 

Resource mailboxes 

50 GB3 

Site mailboxes5 

50 GB 

Public folder mailboxes 

100 GB6 

Group mailboxes 

50 GB 

 

Capacity alerts Office 365 

 

Feature 

Office 365 Enterprise E3 

Warning 

98 GB 

Prohibit Send 

99 GB 

Prohibit Send/Receive 

100 GB 

 

Message limits Office 365 

 

Feature 

Office 365 Enterprise E3 

Message size limit - Outlook 

35 MB1, 2 

Message size limit - OWA 

35 MB1, 3 

Message size limit - Outlook for Mac 

35 MB1, 2 

Message size limit - migration 

150 MB 4 

Size limit for encrypted messages (for subscribers using Office 365 Message Encryption with new capabilities)5 

35 MB 

Size limit for encrypted messages (for subscribers using Office 365 Message Encryption legacy version)5 

25 MB 

Subject length limit 

255 characters 

File attachments limit 

250 attachments 

File attachment size limit - Outlook 

35 MB 

File attachment size limit - OWA 6 

35 MB 

File attachment size limit - Outlook for Mac 

35 MB 

 

Note: 

1 Office 365 Administrators can specify a custom limit between 1 MB and 150 MB. However, the size of message you can send or receive also depends on what your email client or solution supports. For more information about customizing the maximum allowed message size for your organization, see Office 365 now supports larger email messages. 
2 You can send and receive up to 150 MB messages between Office 365 users (where the message never leaves the Office 365 datacenters). Messages that are routed outside of the Office 365 datacenters are subject to an additional 33% translation encoding increase, in which case the maximum message size is 112 MB.  
3 OWA accounts for the possibility that your message may be subject to the 33% encoding increase and restricts the size of message you can send to 25% less than the configured setting. For example, if you customize your settings for a 100 MB maximum message size, you can send messages no larger than 75 MB.  
4 The size of messages to be moved into Exchange Online are computed by Exchange Online. Versions of Exchange prior to Exchange Server 2013 may report a smaller item size. This limit applies to move based migrations using any supported Exchange Mailbox Replication Service. Other migration methods (Cutover, Staged, IMAP, PST) and other third party tools are limited by the general message size limit.  
5 For information about OME with new capabilities, see Set up new Office 365 Message Encryption capabilities built on top of Azure Information Protection. 
6 You cannot attach a single file that exceeds 35 MB. Additionally, you cannot attach files that collectively exceed 35MB. For example, if you attach one 34MB file, you can only attach an additional 1 MB file. 

 

 

Sending limits Office 365 

 

Feature 

Office 365 Enterprise E3 

Recipient rate limit 

10,000 recipients per day 

Recipient limit 

500 recipients 

Recipient proxy address limit 

400 

Message rate limit (SMTP client submission only) 

30 messages per minute  

 

Mailbox folder limits Office 365 

 

Feature 

Office 365 Enterprise E3 

Maximum number of messages per mailbox folder 

1 million 

Warning for number of messages per mailbox folder 

900,000 

Maximum number of messages per folder in the Recoverable Items folder 

3 million 

Storage quota for Recoverable Items folder in primary mailbox (not on hold) 

30 GB 

Storage quota for Recoverable Items folder in primary mailbox (on hold) 

100 GB 

Storage quota for Recoverable Items folder in archive mailbox (not on hold) 

Unlimited2 

Storage quota for Recoverable Items folder in archive mailbox (on hold) 

Unlimited2 

Warning for number of messages per folder in the Recoverable Items folder 

2.75 million 

Maximum number of subfolders per mailbox folder 

10,000 

Warning for number of subfolders per mailbox folder 

9000 

Maximum folder hierarchy depth 

300 

Warning for folder hierarchy depth 

250 

Maximum number of public folders 

250,000 

Maximum number of subfolders per public folder 

10,000 

Warning for number of subfolders per public folder 

9000 

 





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