Remove or Disable Opera Mail client

You can remove the email, news and IM menus from Opera.  It requires editing your Opera.ini file, the [user prefs] section. Add these lines.
Show E-mail Client=0 Show News Client=0 Show IM Client=0
# Show E-mail Client=0, commented out.
You can delete or comment out [...]

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How to Remove or Disable Opera torrent client

I get many questions about Opera’s built-in BitTorrent client from Opera users. The most popular question I get is how to disable the Opera browser from downloading the torrent files, and instead use their preferred torrent client.
What’s good for some isn’t for others. I, for example, only use Opera’s built-in BitTorrent client for small downloads, [...]