You can only use Exchange Online PowerShell to perform the procedure in this topic. To see what permissions you need, see the 'Mailbox settings' entry in the Feature permissions in Exchange Online topic. You need to be assigned permissions before you can perform this procedure or procedures. What do you need to know before you begin?Įstimated time to complete each procedure: 5 minutes or less. However, the total size of rules that are enabled or active in the mailbox can't exceed the quota value There's no restriction on the number of disabled rules that a mailbox can have. The quota for Inbox rules applies only to enabled rules. There isn't a maximum number of rules that users can create. The valid range for the Inbox rules quota is 32 KB to 256 KB. You can't increase the amount of space that's allocated to store Inbox rules in Exchange Online, but you can decrease it to suit your business needs. When you reach the 256 KB limit, you'll be warned that you can't create any more rules or that you can't update a rule. The actual amount of space a rule uses depends on several factors, such as how long the name is and how many conditions you've applied.
Each rule you create will take up space in your mailbox. Inbox rules in Outlook on the web (formerly known as Outlook Web App) and Outlook are limited to 256 KB total for all rules.
