1 - (Default) Placeholder files show the size of the original files.
FileSizeEmulation controls the apparent size of placeholders that were created by a version of Enterprise Vault before 6.0 SP2.
In older versions of Enterprise Vault, placeholders show one of the following sizes:
The size of the corresponding archived items.
Placeholders created by Enterprise Vault 6.0 SP2 and later always show the original file size.
Because placeholders may exist for a long time, both types of placeholder can be present on a system. If both types of placeholder are present, use the default value of FileSizeEmulation so that old placeholders behave in the same manner as new placeholders.