The default maximum file size for PST/OST are as follows for Office 2003, Office 2007, Office 2010 and Office 2013.
Outlook 2013 and Outlook 2010
| Name | Type | Valid Data Range | Default |
| MaxLargeFileSize | REG_DWORD | 0x00000001 – 0x0000C800 | 0x0000C800 51,200 (50 GB) |
| WarnLargeFileSize | REG_DWORD | 0x00000000 – 0x0000BE00 | 0x0000BE00 48,640 (47.5 GB) |
| MaxFileSize | REG_DWORD | 0x001F4400 – 0x7C004400 | 0x7BB04400 2,075,149,312 (1.933 GB) |
| WarnFileSize | REG_DWORD | 0x00042400 – 0x7C004400 | 0x74404400 1,950,368,768 (1.816 GB) |
Outlook 2007 and Outlook 2003
| Name | Type | Valid Data Range | Default |
| MaxLargeFileSize | REG_DWORD | 0x00000001 – 0x0000C800 | 0x00005000 20,480 (20 GB) |
| WarnLargeFileSize | REG_DWORD | 0x00000000 – 0x0000BE00 | 0x00004C00 19,456 (19 GB) |
| MaxFileSize | REG_DWORD | 0x001F4400 – 0x7C004400 | 0x7BB04400 2,075,149,312 (1.933 GB) |
| WarnFileSize | REG_DWORD | 0x00042400 – 0x7C004400 | 0x74404400 1,950,368,768 (1.816 GB) |
These values are controlled through the registry.
[stextbox id=info]NOTE: If the registry key does not exist, you will need to create it.[/stextbox]
| Office Version | Policy Location | User Preference Location |
| Outlook 2013 | HKEY_CURRENT_USERSoftwarePoliciesMicrosoftOffice15.0OutlookPST | HKEY_CURRENT_USERSoftwareMicrosoftOffice15.0OutlookPST |
| Outlook 2010 | HKEY_CURRENT_USERSoftwarePoliciesMicrosoftOffice14.0OutlookPST | HKEY_CURRENT_USERSoftwareMicrosoftOffice14.0OutlookPST |
| Outlook 2007 | HKEY_CURRENT_USERSoftwarePoliciesMicrosoftOffice12.0OutlookPST | HKEY_CURRENT_USERSoftwareMicrosoftOffice12.0OutlookPST |
| Outlook 2003 | HKEY_CURRENT_USERSoftwarePoliciesMicrosoftOffice11.0OutlookPST | HKEY_CURRENT_USERSoftwareMicrosoftOffice11.0OutlookPST |
Additional information (source): KB832925
