Under certain circumstances Enterprise Vault server 9.0 or earlier exhibits the problem described in Microsoft support incident http://support.microsoft.com/kb/312362 "Server is unable to allocate memory from the system paged pool".

This can occur because the EV best practice settings for v90 and earlier automatically set PagedPoolSize value to 0xFFFFFFFF even on systems with 64 GB of RAM available, which is not recommended.

On Windows 2003 systems with > 64 GB of RAM you should set a different value for PagedPoolSize, depending on your specific configuration as outlined in the above Microsoft article.