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This answer suggests moving a large mailbox (50 gb) to a new Exchange database. Will that improve performance, such as moving mail from one folder to another and will it improve search speed?

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    You ought to start by trying to narrow down the source of the performance problem. Don't randomly make changes in the hopes that they'll fix your problem. What does Get-MailboxDatabaseCopyStatus say about the Content Index state? What are the results of Test-ExchangeSearch? Have you run a performance baseline check with the BPA?
    – joeqwerty
    Feb 10, 2015 at 15:46
  • @joeqwerty CopyQueue length = 0, ReplayLength = 0, SearchTime in Seconds = 2,355
    – jao
    Feb 11, 2015 at 8:10
  • Is the search time 2,355 as in two thousand three hundred fifty five?
    – joeqwerty
    Feb 11, 2015 at 11:27
  • I think it is 2 seconds .355.
    – jao
    Feb 11, 2015 at 11:28

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Moving a large mailbox to a different database will only increase performance if the destination database exists on either a different server, or different disk to the source database.

In virtualized environments connected to a SAN, sometimes moving the mailboxes to a database that resides on a different disk may not have a performance benefit because the data may exist on the same physical disk in the storage array.
To get around this, you might consider creating an exchange database on a disk that exists on a different SCSI bus, or a different LUN.

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