Word doesn't 'snoop' documents or send passwords out over the Net of its own accord. The same applies to other MS applications & Windows; unless your system is infected with some form of malware, the only time a password is sent out of your system is if you input it for access to an external system. Your "worry about MS changing to Mass Surveillance Google business model" is baseless.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]