As described here:

http://office.microsoft.com/en-us/outlook-help/create-custom-actions-rules-HA102749447.aspx

I can use custom action in Outlook 2013 rules.

Please tell me, why can't I see "Perform a custom action" in rule action list in Outlook 2013 then?

I've got the same result in Outlook 2013 RTM. The rule action option "Perform a custom action" is missing. Try to install the lasted version of Outlook to check the result.

Tony Chen
TechNet Community Support

• Marked as answer by Tony Chen CHNMicrosoft contingent staff, Moderator Wednesday, April 03, 2013 9:39 AM

I cannot see the  custom action checkbox.. and I am on the latest version of 2013

I'm on the latest Outlook 2013 but also cannot see/find the Custom Rules!

What can I do to find it?

Still not fixed ...

I've got the same result in Outlook 2013 RTM. The rule action option "Perform a custom action" is missing. Try to install the lasted version of Outlook to check the result.

Tony Chen
TechNet Community Support

Not really an answer.