Increase Rules Size Limit for Exchange 2010 Mailboxes (PowerShell)

The rules size limit for mailboxes in Exchange Server 2007/2010 has a default size of 64 KB per mailbox.

The total rules size limit is customisable and can be increased up to a maximum of 256 KB per mailbox. 

Configuration

Open Windows PowerShell as Administrator.

Get the current rules quota for a mailbox:

[PS]> Get-Mailbox [email protected] | FL displayname, rulesquota

DisplayName : Sandy
RulesQuota  : 64 KB (65,536 bytes)

Set the rules quota to its maximum size available, 256KB:

[PS]> Set-Mailbox [email protected] -RulesQuota:256kb

Check the new rules quota:

[PS]> Get-Mailbox [email protected] | FL displayname, rulesquota

DisplayName : Sandy
RulesQuota  : 256 KB (262,144 bytes)

More info can be found on this page.

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