Microsoft Outlook 2013, Microsoft Outlook
2010, Microsoft Office Outlook 2007, and Microsoft Office Outlook 2003
support American National Standards Institute (ANSI) and UNICODE
personal folders (.pst) and offline folder (.ost) files. This article
describes how to use the following four registry entries to limit the
size of both the .pst and the .ost files:
- The MaxFileSize registry entry
- The WarnFileSize registry entry
- The MaxLargeFileSize registry entry
- The WarnLargeFileSize registry entry
Note
The WarnLargeFileSize and WarnFileSize registry entries do not enable
Outlook to warn you before the file size limit is reached.
The MaxFileSize registry entry
The MaxFileSize registry entry determines the absolute maximum
size that both the .pst and the .ost files can grow to. After this maximum size
is reached, Outlook does not permit the size of the file to grow beyond
this size.
The WarnFileSize registry entry
The WarnFileSize registry entry determines the maximum data that
both the .pst and the .ost files can have. After this maximum data is reached,
neither the .pst nor the .ost files are permitted to add any more data.
However, the size of the physical file may still increase because of internal
processes.
In the following table, the MaxLargeFileSize registry entry
and the WarnLargeFileSize registry entry refer to a UNICODE formatted (new
Large format) file, and the MaxFileSize registry entry and the WarnFileSize
registry entry refer to an ANSI formatted (an earlier Microsoft Outlook format)
file. The UNICODE values are set in megabyte (MB) increments, while the ANSI
values are set in byte increments.
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) |
| Office Version | The policy location for the registry entries is located in the following path in Registry Editor | The user preference location for the registry entries is located in the following path in Registry Editor |
| Outlook 2013 | HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\Outlook\PST | HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\PST |
| Outlook 2010 | HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\PST | HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST |
| Outlook 2007 | HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook\PST | HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\PST |
| Outlook 2003 | HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\11.0\Outlook\PST | HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\PST |
Follow these steps to configure the size limit for both the .pst and the .ost
files.
Note The settings that are discussed in this
article apply to both .ost and .pst files. If you modify these registry
values, this can affect .ost files that are used with Cached Exchange
Mode, with AutoArchive, and with .pst. files. If Outlook is configured
to download shared folders, the contents of shared folders are stored in
the local Offline Outlook Data (.ost) file. If the shared folders
contain many items or large attachments, the size of the .ost file may
grow significantly. Additionally, Outlook 2013 introduced support for
Site Mailboxes. If an Outlook 2013 client is working in a Microsoft
Exchange Server 2013/Microsoft SharePoint 2013 environment and is
granted permission to a site mailbox, the site mailbox is automatically
added to the Outlook 2013 profile. If Download Shared Folders is
enabled, the site mailbox contents are synchronized to the local .ost
file. This can result in the .ost file exceeding the set limit. For more
information about the Download Shared Folders setting in Outlook, click
the following article number to view the article in the Microsoft
Knowledge Base:
982697 By default, shared mail folders are downloaded in Cached mode in Outlook 2010 and Outlook 2013
Important
This section, method, or task contains steps that tell you how to
modify the registry. However, serious problems might occur if you modify
the registry incorrectly. Therefore, make sure that you follow these
steps carefully. For added protection, back up the registry before you
modify it. Then, you can restore the registry if a problem occurs. For
more information about how to back up and restore the registry, click
the following article number to view the article in the Microsoft
Knowledge Base:
322756 How to back up and restore the registry in Windows
- Click Start, and then click
Run.
- In the Open box, type
regedit, and then click OK.
- In the left pane, expand My Computer, and
then expand HKEY_CURRENT_USER.
- Expand Software, and then expand
Policies.
- Expand Microsoft, and then expand
Office.
- Expand 11.0 for Outlook 2003, 12.0 for Outlook 2007, or 14.0 for Outlook 2010, or 15.0 for Outlook 2013, and then expand Outlook.
- Click PST, and then right-click
MaxFileSize in the right pane.
- Click Modify, and then type the value in
the Value data box.
- Click OK.
- Right-click WarnFileSize, and repeat steps
8 through 9.
- Right-click MaxLargeFileSize, and repeat
steps 8 through 9.
- Right-click WarnLargeFileSize, and repeat
steps 8 through 9.
Note You may have to create the registry values if they do not exist.
If the registry values do not exist, follow these steps to create them.
- Click Start, click Run, type Regedit, and then click OK.
- In the left pane, expand following registry key:
For Outlook 2013
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\Outlook
For Outlook 2010
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook
For Outlook 2007
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook
For Outlook 2003
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\11.0\Outlook
- Right click Outlook, point to New, and then click Key.
- Type PST, and then press ENTER.
- Right click PST, point to New, and then click DWORD value.
- Type MaxFileSize, and then press ENTER twice.
- In the Edit DWORD Value window, choose Decimal and type the value in the Value data box, and then click OK.
Note 1GB=1*1024*1024*1024byte; 1MB=1*1024*1024byte; 1KB=1*1024byte, the example below is for 1GB.
- Repeat steps 3 through 7 to create another DWORD WarnFileSize.
- Repeat steps 3 through 7 to create another DWORD MaxLargeFileSize.
- Repeat steps 3 through 7 to create another DWORD WarnLargeFileSize, and then close the registry.
Note For mass deployment of these registry keys on end-user machines, the ORK tool can be used.
To automate the registry creation on end-user machines, use ORK for deployment scenarios.
It is recommended that the values between the MaxFileSize
registry entry and the WarnFileSize registry entry, and the values between the
MaxLargeFileSize registry entry and the WarnLargeFileSize registry entry be at
least 5 percent (%) so that internal processes are not hindered from
continuing.
If the value of the MaxFileSize registry entry ever
exceeds the ANSI 2 gigabyte (GB) limit on either the .pst or the .ost files,
the value will be ignored to limit the size to 2 GB to prevent corruption. The
default value for the WarnFileSizeregistry registry entry is calculated to be
95% of the MaxFileSize registry entry for a UNICODE file, and it remains at
1,950,368,768 bytes for small ANSI files.
Note You can set the UNICODE limits beyond the values that are listed
in the table. However, we do not recommend doing this because
performance can decrease.
If .ost files or .pst files reach
the limit that is specified in the WarnFileSize or the WarnLargeFileSize
registries, the compaction function is triggered to try to reduce the
size of the file to a usable level. When the WarnFileSize or the
WarnLargeFileSize limit is reached, e-mail messages cannot be sent
(provided that sent e-mail messages are stored in the Sent Items
folder), and items cannot be copied or moved within the file. If the
file is an archive .pst file that is used for AutoArchive, the
AutoArchive operation will fail. However, e-mail messages can be
deleted or archived from a .pst or from an .ost file that is currently
being used as the default delivery location.
The following are some of the errors that may occur when files reach the maximums specified in the registries:
- When you try to move items to a .pst or an .ost file that has reach the limit, you receive the following error message:
Can't
move the items. The file
\.pst has reached
its maximum size. To reduce the amount of data in this file, select
some items that you no longer need, and then permanently delete them.
- When
e-mail messages are delivered to a .pst or an .ost file that are using
Cached Exchange Mode, and the file has reached the limit, the Mailbox
Cleanup wizard launches.
Sumber : http://support.microsoft.com/kb/832925
