- 1). Log on to your PC computer with an administrative account.
- 2). Open the Start menu and click "Run."
- 3). Type "regedit" into the text field and hit "OK" to launch the Registry Editor.
- 4). Use the database tree on the left side of the window to navigate to the HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\11.0\Outlook directory.
- 5). Open the "Edit" menu at the top of the window and choose "Key" from the "New" subfolder.
- 6). Type "PST" and hit the "Enter" key to name the new value you are creating.
- 7). Go back to the "Edit" menu and select "New DWORD Value" from the list of options.
- 8). Label the new value "MaxFileSize" and then enter the amount of space you want your Outlook mailboxes to be.
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