I use windows, but I do not use MS office, I am using libreoffice, and I get my email from the website and not from an email app. I have noticed that if I do a large job with calibre that it really slows things down but I have only once crashed my computer due to calibre and that was when I tried to convert my complete library of over 5000 books at one time. Yes that was stupid on my part and I have not tried that again.
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