Harry Bates has written PSTSetMax to configure the size limit for both (.pst) and (.ost) files in Outlook 2003.
When you type PSTSetMax /?, you receive:
Microsoft Knowledge Base Article 832925 contains the following summary:
Microsoft Office Outlook 2003 supports both 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|
The MaxFileSize registry entryThe 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 2003 does not permit the size of the file to grow beyond this size.
The WarnFileSize registry entryThe 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.
|Name||Type||Valid Data Range||Default|
|MaxLargeFileSize||REG_DWORD||0x00000001 – 0x00005000||0x00005000 20,480 (20 GB)|
|WarnLargeFileSize||REG_DWORD||0x00000000 – 0x00005000||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)|
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: