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#560
The only Windows 7 file changed in the Windows Mail folder using the tutorial steps is the msoe.dll. All the other original Windows 7 files remain intact. Consequently any updates applicable to those other files will be covered by normal Windows Updates. So as long as you run the Windows Updater periodically you will be OK.
Re your second question it is best to have update KB978542 installed in case it also affects any other files to protect them from security breaches. So if you haven't got it installed this is what you need to do.
Run Windows Update to get KB978542. Installing it will bork the msoe.dll as this is a Vista file. So you will then need to replace the msoe.dll again using Step 4 of the tutorial. Don't forget to reboot to activate it.
Note that the msoe.dll in Step 4 of the tutorial comes from a Vista system in which the msoe.dll has been modified by KB978542, and hence is not vulnerable to the potential security breach. Also once the update is installed, Windows Update machine will not try to download it again in the future, which would bork msoe.dll again.
Hope this answers your question. Cheers PB