Hello Slavic and welcome to the Eight Forums,
Thank you for your words.
The Win7 and Win8/10/Server reinstate instructions are NOT almost the same by any means, well, similarities, but in most.. ...heck it's too much to type and I would just be repeating myself over the years, and all information is within post 1 & 2 and their spoiler notes.
We are not going to remove the Calendar button, actually many people still like to use it and works fine, of which I replied in that thread a few months ago. However I don't use it myself, I never had a need to, and actually I don't even have the Calendar button showing since I, as all of your can do, easily customize the tool bar and remove that, or make the tool bar however you want it.
I carry those toolbar settings over to all OS's even though I don't show that in most all of my screenshots in the tutorial, which I leave stock just for stock screenshot sake, but you can bet it's not like that on any of my OS's.
Here's my tool bar settings that I use across Vista/Win7/Win8/Sever/Win10. I remove lots of stuff I don't use, and I like the no frills clean look of it, and more intuitive functionality, re-arranging things and using extra Separators. I explain how to one-click carry over those settings into clean installs, restores, or installing different OS's; actually I take All WinMail identical settings/emails with me to whichever OS's I'm on at the moment. I explain how to do that in the spoiler notes.
For example here's s a screenshot I just took showing the top of my local folder Inbox toolbar with how it displays:
...customize them whichever way pleases you, but these are what works best for me, ymmv. (click images to open full)
Also here's one of how I re-arranged my Newsgroups toolbar too:
(showing random newsgroup)
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I've never have had any problem with the send/receive progress panel, never, and I use WinMail every single day for the last...I've lost count of the years now but since the beginning. I have 7 personal email accounts, and use dozens of newsgroups within WinMail. I don't know what's causing your problem but as well I am not sure what you are really using for files, reg's, etc, but I suggest take some time, read the entire tutorial. Don't just assume just because you have been using it for so long and got it going, that there is not some new useful information hidden in the post 1 or 2 notes, etc. Don't forget to read the bug list too.
I don't give instructions how to change languages around. I only know how to speak English, and the other users from other languages know how to do it already themselves. Many have discussed it over the years, even recently. Actually in the back of my mind I've always considered to get all the different language files together and offer them as a download with instructions how to do it, but I never had enough people request it; I even have a post 3 slot saved and was going to put that (along with other things) there but never got around to it because of the lack of the demand.
Anyway, don't assume anything and take some time to carefully read over all the notes on post 1 & 2 and the bug list - it's jam packed with info, and over the years I've Constantly updated them even with the tiniest detail to make them the best I could, and will continue to do so.
As always I'm open for new ideas, and thank you for yours