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A major source of useful personal information is the user's own email. However, I have noticed that there appears to be no way to search for text, etc. in the non-Gmail email app on my Samsung devices and I understand same thing is true of other manufacturers' email applications. I suspect that Google are not keen on people keeping their data in anything other than Gmail so they only provide the search facility when you use their system.
It occurred to me that it might be useful if there could be a way to get one's text data out of email and into Lexiy. Searching would be possible, the data would be useful and the storage would be secure.