Increase your rule limit size in Office 365

If you’re anything like me and have a lot of rules in your inbox, you may be very close or already hit your limit of allowed rules.

By default in 365 your rule limit size is 64k , you can increase this with the below command:

set-mailbox -identity -RulesQuota 256kb

The limit is 256kb so you can put any value below this also.

You should now be able to create more rules without any errors J

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