Understanding Exchange 2010 Database Whitespace

I am trying to troubleshoot poor performance in our Exchange environment.   how much "AvailableNewMailboxSpace" should be visible for each database?    should a 200gb database have 100gb whitespace or 100mb of whitespace?
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Will SzymkowskiSenior Solution ArchitectCommented:
Whitespace is only ever determined after the online maintenance has been run. Once online maintenance has successfully completed, you will re-claim any whitespace that is available due to your cleanup tasks that were performed on a database before the maintenance was performed.

This includes...
- deleted mailboxes
- mailbox moved to another database
- users deleting email

Whitespace will be used before the database continues to grow. You can also run the following command to see how much whitespace is available...

Gte-mailboxdatabase -status | fl Name, AvailableNewMailboxSpace

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IF you have more that 20% of database size white space then ideally you should reclaim it.....Whitespace does not impact mailbox performance much
MorrisonCohenAuthor Commented:
So rule of thumb is to have 20% white space. What happens if you have 0% white space and u have many emails coming in that day - would you feel a performance hit?
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MorrisonCohenAuthor Commented:
Is that correct?
It should not.
Seth SimmonsSr. Systems AdministratorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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