Service description (limits) — Microsoft 365 Business

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Facts read from this source

• Limit categories Report an error

  “The limits in Microsoft Exchange Online fit into one of the following categories: Address book limits Capacity alerts Distribution group limits”

• Address list limit Report an error

  “Address list limit 1000 1000 1000 1000 1000 1000”

• Oab limits Report an error

  “Offline address book (OAB) limit 250 250 250 250 250 250”

• Abp limit Report an error

  “Address book policies (ABP) limit 250 250 250 250 250 250”

• Gal limit Report an error

  “Global address lists limit 250 250 250 250 250 250”

• Oab constraints Report an error

  “A maximum of 20 address lists can be assigned to a single offline address book (OAB). The maximum size of a single offline address book is 1GB.”

• Capacity alerts warning Report an error

  “Warning 98 GB 98 GB 98 GB 49 GB 98 GB 1.96 GB”

• Capacity alerts prohibit send Report an error

  “Prohibit Send 99 GB 99 GB 99 GB 49.5 GB 99 GB 1.98 GB”

• Capacity alerts prohibit send receive Report an error

  “Prohibit Send/Receive 100 GB 100 GB 100 GB 50 GB 100 GB 2 GB”

• Distribution group members Report an error

  “Maximum number of distribution group members1 100,000 members”

• Distribution group send limit Report an error

  “Limit sending messages to large distribution group* 5,000 or more members”

• Distribution group owners Report an error

  “Maximum number of distribution group owners 100”

• Groups user can create Report an error

  “Maximum number of groups a user can create 300,0002”

• Ddg limit Report an error

  “Dynamic distribution group (DDG) limit 3,000”

• Activesync device limit Report an error

  “Exchange ActiveSync device limit 100 100 100 100 100 100”

• Activesync device deletion limit Report an error

  “Exchange ActiveSync device deletion limit 20”

• Hold limits Report an error

  “Maximum number of Microsoft 365 retention policies per tenant: 1,800 Maximum number of holds per mailbox: 25 is the recommended maximum before performance might be impacted; 50 is the supported limit.”

• Hold tenant maximum Report an error

  “These count towards the 10,000 per tenant maximum for compliance policies”

• Journal rules limit Report an error

  “Maximum number of journal rules 300 rules”

• Transport rules limit Report an error

  “Maximum number of transport rules 300 rules”

• Transport rule size limit Report an error

  “Maximum size of an individual transport rule 8 KB”

• Transport rules regex limit Report an error

  “Character limit for the sum of all regular expressions (MatchesPatterns) and Simple expression (ContainsWords) used in all transport rules 20 KB”

• Attachment content scanning Report an error

  “Scanning limits for content of attachments 1 MB”

• Transport rule recipients added Report an error

  “Maximum number of recipients added to a message by all transport rules 100 recipients”

• Forwardee limit Report an error

  “Forwardee limit 10 recipients”

• Inbox rule redirect limit Report an error

  “Number of times a message is redirected 1 redirection”

• Inbox rule quota Report an error

  “Inbox rule 256kb1”

• Messages per folder Report an error

  “Maximum number of messages per mailbox folder 1 million”

• Recoverable items messages per folder Report an error

  “Maximum number of messages per folder in the Recoverable Items folder 3 million”

• Subfolders per mailbox folder Report an error

  “Maximum number of subfolders per mailbox folder 10,0003”

• Folder hierarchy depth Report an error

  “Maximum folder hierarchy depth 300”

• Archive mailbox quota standalone Report an error

  “Archive mailboxes8,9 100 GB1 50 GB 1.5 TB2 Not available5”

• User mailbox storage standalone Report an error

  “User mailboxes 2 GB1 50 GB 100 GB 2 GB”

• Public folder mailboxes count Report an error

  “You're limited to 1,000 public folder mailboxes, and the maximum total size of all public folder mailboxes is 100 TB.”

• Shared mailbox licensing Report an error

  “To access a shared mailbox, a user must have an Exchange Online license, but the shared mailbox doesn't require a separate license. Without a license, shared mailboxes are limited to 50 GB. To increase the size limit to 100 GB, the shared mailbox must be assigned an Exchange Online Plan 2 license.”

• Shared mailbox archiving prohibited Report an error

  “Archive mailboxes can only be used to archive mail for a single user or entity (such as a shared mailbox) for which a license has been applied. Using archive mailboxes as a means of storing mail from multiple users or entities is prohibited.”

• Auto expanding archiving Report an error

  “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. Additional storage space is added incrementally until the archive storage capacity reaches 1.5 TB”

• Message size outlook Report an error

  “Message size limit - Outlook 150 MB1,2”

• Message size owa Report an error

  “Message size limit - OWA 112 MB1,3”

• Message size mobile Report an error

  “Message size limit - Outlook for iOS and Android 33 MB”

• Message size encrypted Report an error

  “Size limit for encrypted messages (for subscribers using Microsoft Purview Message Encryption)5 100 MB”

• Message size default customizable Report an error

  “The default maximum message size for Microsoft mailboxes is 35 MB for sending and 36 MB for receiving. Microsoft administrators can specify a custom limit between 1 MB and 150 MB.”

• Subject length limit Report an error

  “Subject length limit 255 characters”

• File attachments limit Report an error

  “File attachments limit 250 attachments”

• Multipart message limit Report an error

  “Multipart message limit 250 parts”

• Embedded message depth limit Report an error

  “Embedded message depth limit 30 embedded messages”

• Message header size limit Report an error

  “Message header size limit: Specifies the maximum size of all message header fields in a message. The current limit is 256 KB. Individual headers are limited to 32KB each.”

• Onedrive attachment size Report an error

  “Classic file attachments have a limit of 112 MB, but OneDrive file attachments can be up to 2 GB.”

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