MS has a long-standing reputation of generating bloated HTML with all kinds of bad proprietary markup injected in it. Not sure if the latest EW still does that or not.
Naturally, you can use what you like ... just be aware that it may contribute to incorrect page validation or larger pages than needed, etc.
And beware of using its FTP or Publish features. They may be fine for HTML-only sites, but when you introduce template-driven functionality like Zen Cart, those features should be avoided. A regular dedicated FTP program is far more reliable anyway.
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