Exchange Server's 32 KB Rules Limitation

In Outlook 2000, you could force rules to be client rules, which are stored in Outlook, and have many more rules. This does not work in Outlook 2002 and 2003 - all rules, both client and server, are stored on the Exchange server and subject to the 32 KB size limit.

 In Exchange server 2007, the limit is higher - 64KB by default and configurable up to 256KB. This change will allow in the neighborhood of 100 rules, or about 90 more than I want to manage in the Rules dialog.

If you use Exchange 2007 and need more space for rules, speak with your administrator and ask him to raise the limit. If you're an admin and don't know how to change the rules, use the following cmdlet in the Exchange management shell to raise the limit to 256KB.
Set-Mailbox username -RulesQuota:256KB

See http://technet.microsoft.com/en-us/library/bb123981(EXCHG.80).aspx for more information

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