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MSExchangeIS Event ID 9667 Failed to create a new named property for database

I been having this error in my event viewer for a few years I think. I read that I can increase the Named Props Quota in the registry. But the right move would be to move all mailbox's to a new database and move them back to the old one. My "priv1.edb" is around 45gb. Used space on the drive is 69GB and free space is 33GB. What I want to know is do I have enough space on this drive to move mailbox's back and fourth? I never movied mailmox's before or created a new Database(store). Any help would be appreciated. Can i set the  " Named Props Quota" to 16384 and Dismounted and remount the store and buy me a few days of time? What if the store does not remount? I am already getting the "A non-delivery report " in the event viewer now.

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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Take a good backup of databases.

Database should remount as you will be dismounting gracefully ...... If you say Database is 45GB (Is that both EDB and STM) ? ..... What is the amount of white space available, check event 1221

- Rancy
SkunnyAuthor Commented:
Here is the event 1221

Event Type:      Information
Event Source:      MSExchangeIS Mailbox Store
Event Category:      General
Event ID:      1221
Date:            1/31/2013
Time:            6:04:25 AM
User:            N/A
Computer:      Server
The database "First Storage Group\Mailbox Store (Server)" has 6847 megabytes of free space after online defragmentation has terminated.

priv1.edb = 45GB
priv1.stm = 20GB

I changed  " Named Props Quota" to 20k.  Dismounted and remount the store with no problem.
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Awesome so there is 6.5GB of white space only .... not much options as no user has huge mailbox as well

- Rancy
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