Article ID: 2661071 - Last Review: January 4, 2012 - Revision: 1.0

Exchange Server 2010 databases grow very large when the Calendar Snapshot feature is enabled

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SYMPTOMS

Consider the following scenario:
  • You install Microsoft Exchange Server 2010.
  • The Calendar Snapshot feature is enabled in Exchange Server 2010.

    Note The Calendar Snapshot feature is enabled by default.
  • Users create and change many calendar items. Users also have multiple delegates that create and change calendar items.
In this scenario, the Exchange Server 2010 databases and transaction logs may grow very large. When you run the Get-MailboxStatistics cmdlet or the Get-MailboxFolderStatistics cmdlet to obtain information about a mailbox, the mailbox size may be 50 gigabytes (GB).
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CAUSE

This issue occurs because a snapshot of a calendar meeting or an appointment is created every time that a meeting or an appointment is created or changed. These snapshots are stored in the Recoverable Items folder.

Note The Recoverable Items folder replaces the dumpster feature in Microsoft Exchange Server 2007.
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WORKAROUND

To work around this issue, turn off the Calendar Snapshot feature. To turn off the Calendar Snapshot feature for a single user, at a command prompt, run the following cmdlet:

Set-mailbox user_name -CalendarVersionStoreDisabled $true
To turn off the Calendar Snapshot feature for all users, at a command prompt, run the following cmdlet:
Get-mailbox –ResultSize unlimited | Set-mailbox -CalendarVersionStoreDisabled $true
Note After you turn off the Calendar Snapshot feature, you should run the Start-ManagedFolderAssistant cmdlet to process existing items in the mailbox.
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MORE INFORMATION

For more information about the Set-mailbox cmdlet, visit the following TechNet website:
http://technet.microsoft.com/en-us/library/bb123981.aspx (http://technet.microsoft.com/en-us/library/bb123981.aspx)
For more information about the Start-ManagedFolderAssistant cmdlet, visit the following TechNet website:
http://technet.microsoft.com/en-us/library/aa998864.aspx (http://technet.microsoft.com/en-us/library/aa998864.aspx)
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APPLIES TO
  • Microsoft Exchange Server 2010 Standard
  • Microsoft Exchange Server 2010 Enterprise
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