Increasing the rule quota limit/size (Exchange 2007)

This has always bugged me. When using Exchange you have a limit on how many rules
you can create for your mailbox. At first sight you might say,what is the big deal-you almost
never hit the limit. The problem is that once one of your users does actually hit the limit
you have no compelling explanation as to why the limit for Exchange servers up to 2007
was 32KB (

In Exchange 2007 this changes, and the limit can be changed to either 64KB, 128KB or
256KB. This can be done by using a cmdlet called set-mailbox.

Set-Mailbox <mailbox> -RulesQuota:<size>

The specific attribute being changed is called appropriately: RulesQuota .

2 thoughts on “Increasing the rule quota limit/size (Exchange 2007)

  1. The 32KB limitation was tied to the size of a single RPC packet. All the rules had to fit in this packet. If your rules were concise, using fewer bytes, you might get a couple of rules more in there.

    When they moved to Unicode, the limit didn’t change. Rules increased in size but still had to fit into 32KB. Fewer rules made it in. They found a way to make it worse before it got better.

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