This article was previously published under Q147373
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The Remove All option of the Microsoft Exchange Server version 4.0 Setupprogram does not remove all the Microsoft Exchange files and directories.In particular, the directory structure appears intact and there are filesleft in some of the subdirectories.
This is by design. Setup will delete all files that were installed by Setupexcept those that have a different time stamp, indicating that they werechanged. Directory (DS) and Information Store (IS) data files are deletedso that they won't affect a new installation on the same server. Any otherfiles that were not originally installed are not deleted. The directorytree remains intact and Microsoft Exchange settings in the registry areremoved.