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Windows Diff for Exchange Customizations.

The customizations in Exchange are manual edits to config files that are not exposed to the gui or ECP.

They are overwritten upon patching/upgrading to newer Cumulative Updates or Security Updates (CU's or SU's).

Be sure to save a copy of the configs in an immutable directory that are clearly marked with the date.

To inspect differences after and patch/upgrade, use the DIFF command.

diff (cat 'E:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\ecp\Web.config') (cat e:\atemp\overrides\V15\ClientAccess\ecp\Web.config-v221013)

This will also work over UNC paths:

diff (cat 'E:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\ecp\Web.config') (cat \\server-name-here\e$\directory-name-here\overrides\V15\ClientAccess\ecp\Web.config-v221013)