A user cannot create new rules in Microsoft Outlook or in Outlook Web App (OWA). Additionally, the user receives the following error message:
One or more rules cannot be uploaded to Microsoft Exchange and have been deactivated. This could be because some of the parameters are not supported, or there is insufficient space to store all of your rules.
This issue occurs because, by default, the size limit of the rules in the mailbox is set at 64 kilobytes. If the size of the rules reaches this limit, the user receives an error message.
To resolve this issue, increase the size limit for rules in the mailbox. To do this, follow these steps:
- To determine the size limit for rules in a mailbox, run the following command in the Exchange Management Shell:get-mailbox -identity <mailbox> | fl *rulesquota*
- If the current size limit is less than 256 kilobytes, run the following command to increase the size limit to 256 kilobytes:set-mailbox -identity <mailbox> -RulesQuota 256kb
Tenant admins can also increase the size limit of the rules for their users in a Microsoft Office 365 environment. For more information, visit the following Microsoft website: