What is Exchange Installable File System (IFS), and what does it do?
Exchange IFS allows direct access to Exchange 2000 Information Store data at the file system level. This is accomplished by exposing a file system drive letter that represents the Information Store. Exchange IFS provides Microsoft Win32® API support for the Exchange 2000 Information Store. Clients such as Microsoft Windows® Explorer, Command Prompt, and Microsoft Office applications, will be able to treat an Exchange 2000 Information Store as a file system and use Win32 API calls to store, retrieve, and find documents.