A user cannot create new rules in outlook or Outlook Web App


The issue occurs because, by default the size limit of the rules in the mailbox is set to 64 kilobytes


To resolve the size limit for rules in the mailbox. To do this follow these steps:

  1. To Determine the size limit for rules in a mailbox, run the following command in the EMS              

Get-Mailbox –identity <mailbox> | fl *rulesquota*

  • If the current size limit is less than 256 kilobytes then run the following command

Set-Mailbox –identity <mailbox> – rulesquota 256kb

After increasing the size of RulesQuota the issue got Resolved 🙂

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