thanks for all the reply.
I chose the standalone Mail client because I used Opera for a very long time and I used its built-in mail client for years.
Unfortunately I had to ditch the old Opera because more and more pages became sluggish or even non-functional. The 64 bit version of Opera was even less reliable in my experience. I finally switched to a different browser and using two different browsers side by side just to use one's built-in client was not an option.
Opera Mail seemed to be the right choice because it uses the same engine and I hoped the transition will be smooth.
And so it was.
But if it is abandoned by Opera as you guys say I have to find another e-mail client.
Any ideas besides Thunderbird and Outlook?
Thanks in advance,