The Microsoft Exchange Information Store Integrity Checker (Isinteg.exe)
is used with the -PATCH option to modify the base GUID (generated unique
ID or globally unique identifier) used by an information store. This
procedure is performed after an information store is restored to ensure
that the GUIDs assigned to objects in the information store are unique.
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A GUID is a 64-bit hexadecimal string that uniquely identifies a
particular object. In the information store, the public and private
information stores have base GUIDs that are used to generate GUIDs for
all other objects, including folders, messages, and attachments.
After you restore an information store, the information store does not
know which GUIDs have already been assigned. If you do not change the
base GUID, the public and private information stores may generate GUIDs
that are not unique.
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