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 here: https://support.microsoft.com/kb/886616

2 thoughts on “Increase Rules Size Limit for Exchange 2010 Mailboxes (PowerShell)

  1. You don’t bother to explain that Get-Mailbox isn’t automatically available in Powershell, even as Administrator. This detail might be really useful.

    • I honestly don’t remember whether Get-Mailbox was available by default or not. I don’t have Exchange 2010 anymore and cannot easily verify this, therefore you may be right.

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