@WildEnte In an attempt to avoid further confusion I have re-worded the title of this request, previously: "Launch Vivaldi Mail as a separate stand alone app". So this is just a note to put your comment back in context. Thank you.

In compose it does. In contacts it doesn't. When I'm looking for the mails sent to/from John private, I may have to click on 3 contact listings before I get the correct mails listed.
The way name and addresses is shown in compose, is the way I think it should be shown in contacts as well

@antjewagner welcome to the forum!

You've found one of the weak spots. The contacts management in Vivaldi is currently quite basic, focus is on the mail client itself. Contacts are only generated from your email database and whatever you add/modify manually.

The existing feature request here -> https://forum.vivaldi.net/topic/53314/contacts-carddav-sync is about adding real contacts management to Vivaldi. Please consider upvoting that request by hitting like on the first post.

@ayub mail should not draw that much power, from my point of view it's a bug. Please file one here https://vivaldi.com/bugreport/

A while ago Mail CPU issues could be fixed by doing a pretty hard reset of the mail index. Maybe this helps here too...? See https://forum.vivaldi.net/topic/84788/mail-calendar-feeds-hogging-cpu/

@Pesala, I've tested it once again and found the symbol is still added to the CC/TO/BCC fields. Below are the lines from the raw delivered message.

To: =?UTF-8?Q?=E2=AD=90Maxim_Gonchar?= <...> Cc: =?UTF-8?Q?=E2=AD=90Maxim_Gonchar?= <...> Subject: test

The reason I did not see it before is because Vivaldi Mail overrides TO/CC fields with the ones from the contacts.

@TryingNewThings custom format is a good idea.. Tel numbers are different on country basis

@Hadden89 I am installing Mint daily, initially to get rid of trackers now my Mac fails(the SCSI is bust/ overheated). So I notice tiny things here. Like the front page has 2 download buttons. Vivaldi has "Save As" so it can download OS images to other partitions.
Here, there is "Browser, Mail, News, Community, About" lines takes me to the Community discussion about Mail, and not to Mail. Put that beside the icon and add "mailcount" when logged in on Webmail. Please explain in CSS how to capture that mail arrives. "Mail" should go to login page. I use the address bar.
There is no "local" profile for anyone, just community Id and mail log-in and sync Id. You have to make special local Id, - like Knuthf:local as different to Knuthf:sync and Knuthf:mail.
Tell Jon that Sintran is back. I prefer this order, because the suffix is a clarification of scope, just as a service number/port number. So digits are not allowed and "Hadden:89" is not, "Hadde:n89" will be less than "Hadde:n90" - you probably have a reason for making "local" and "public" profiles. I have "local" for own LAN, the same subnet. And I see a need for "Group" and "Project" identities, to be flexible and allow people to move around in an organisation.

@S_Paternotte Searching this forum with "outlook" gives you some interesting threads, i.e.:

Outlook.com and M3

Trouble with Outlook.com

Outlook PWA Calendar

MS and outlook account