Brienne is right.
Under your last folder (before Groups) click on "More".
This will take you to the Folders side window. On top you will see your "Favorites" folders, under that will be your login name and the same list of folders as are shown in "Favorites".
Right-click on the folder that you want to rename that is listed under your name.
I think I figured it out (for me, at least)! You may be trying to edit your folders looking at them in "Favourites". Remove them from your "Favourites", click "More" under "Folders", then you will be able to right click and rename or delete the folder you created.
I was able to find solutions on the web for your other questions on selecting multiple emails and rule creation but this one seems to be a known problem with Outlook on Web. I've found a few similar questions and feature requests from Microsoft.
I've tried to select multiple emails from my own search results. I've did somehow manage to do it but can't ...
A few things to double check:
Are you clicking in the list of folders on the left immediately after you sign in?
Also, are you sure you're logged in as the same user that originally created those folders?
I have no idea if the French site is the same as the one English users are presented with-- I even selected the Junk Mail folder and still had the option ...
Yes, it is possible.
As @Luke the Geek pointed out in the comments, there are third-party utilities that will allow you to do this. This may be your best option if you have an older version of Windows.
But, there is a native method in Windows 10 (and likely other Windows platforms, such as their mobile ones) for accomplishing this: use the People app.
I completely agree about Microsoft Flow. It's the only working way I've found to integrate Outlook 365/Outlook.com integration with Google Calendar). Microsoft Flow is a service similar to IFTT, except geared to work with Office 365 services (and IFTT can't do this).
Here's a bit more information:
The free level of Flow allows for 750 "events" per month. ...
It works pretty much the same way:
Get a public shared calendar url from your calendar at Google (available in the calendar settings, section "Integrate Calendar", it's called "Secret address in iCal format")
Subscribe to the calendar in Outlook using this url (File > Account Settings > Account Settings, "Internet Calendars" tab)
A detailed tutorial may ...
You can do that with Instant Search as well, although it might not be directly obvious how because searching between specific dates requires a specific notation.
If you’d like to type your query directly, then you can type the following in the Instant Search field if you want to search for emails that have been received in the month of April 2018:
You still can't turn it off. Microsoft sent me this link today so that I could "Vote to have it looked into". https://outlook.uservoice.com/forums/284136-outlook-com/suggestions/32166424-create-option-to-remove-top-results-from-search-in
There are many keywords such as From:, To:, Subject:, Date between: and so on.
The only place where these are mentioned, are on this third part blogpost: https://www.lifewire.com/search-mail-outlook-com-1170664
Only user created folders can be renamed. I've checked to see if this the same on the Outlook desktop application and found out that it is so.
The statement from Microsoft about this issue: You can't rename or move default folders such as Inbox, Drafts, or Deleted Items.
You are most probably selecting a default folder. Try selecting one of your personal ...
(Using the online Office 365 Outlook)
If you have a lot of emails to remove a better way is to create a rule that moves all the emails containing the search term "Goldilocks" into the Deleted Items folder.
A safer method would be to create a folder and move them into that, then you can check them before selecting the "Delete All" button.
If you spend a minute searching, you will find all the articles are how Send As permissions should work with Office 365, Exchange Online and Outlook 2016. We read them all and were still getting (despite checking and re-checking permissions):
This message could not be sent. You do not have the permission to send
the message on behalf of the specified ...
This Office 365 Help page from GoDaddy should address your problem.
Send as a distribution group address
If you are an Office 365 admin, you can give members of a distribution group the permission to send as the distribution group address.
In your Office 365 account, click on Dashboard.
Click Launch Office 365.
Log in using your Office 365 email address, ...