I have recently started receiving the EventID 9667, msgidNamedPropsQuotaError on a Exchange 2007 mailbox server. Research has shown that the server has reached the default quotas for named propertiy entries for the database. These can be increased by adjusting the values in the registry of the "Named Props Quota" and "NonMAPI Named Props Quota" for a mailbox database or "Replids Quota" for a public database.
KB articles say the default limits are 16384 for the "Named Props Quota"(NPQ) and "Replids Quota"(RQ) and 8192 for the "NonMAPI Named Props Quota"(NNPQ). They also say that each database has a hard limit of 32766. They say if you reach that limit, you will have to create new databases and move the users out and then back in to reset the numbers. They also say you should not set the quotas to the max limits. However, the instructions on how to change the values say to enter a number between 1 and 32767.
Currently, my registry only has the NNPQ setting with a value of 8192. The 8192 value is the one being referenced in my event log errors.
Event ID 9667: http://technet.microsoft.com/en-us/library/bb851495.aspx
How to configure: http://technet.microsoft.com/en-us/library/bb851493.aspx
What they mean: http://technet.microsoft.com/en-us/library/bb851492.aspx
What they don't say is how the numbers relate to each other.
Since the NPQ and NNPQ both affect the mailbox database, do their combined values need to stay below 32766 or are their limits separate?
Do I only need to update the value that is already in the registry or should I be creating the others?