@bers good point, thanks.

@bers not sure I get the point... can you elaborate, please? Please note, my main argument is not to add the vendor, my main argument is to continue the historic notation (only because the historic tag notation includes the vendor it should be included here as well: office365 notation <> ms-office-2019, ms-office-2016, ...). For the windows tag this aspect is already fulfilled: Windows-10 notation = Windows-8, Windows-7 etc.)

@IsayReinstateMonica ah, ok now I understand what you mean, thanks. Let me give that a few thoughts. Maybe the Office365 desktop&store apps would be better described by a new tag...

@IsayReinstateMonica yes, but this is not the feature list for "Office 365 desktop applications/apps". What you are referring to are the cloud services available by MS (within the Office domain) like one drive etc. This is not what my question here is about, I'm only referring to the (installable) standalone client application (as desktop application and online store app). Although there are also called "Office 365" (and have a certain "connection" with the standalone applications) cloud services are something fundamentally different.

@Alex stackexchange.com/sites#

@IsayReinstateMonica can you elaborate? Not sure I agree. Essentially it's the same type of difference you have between the windows versions. Win 10, same as Office365 is a continues update scheme. Desktop application (offline installation files) and Apps (windows online store installations), is a different aspect which applies to a broad range of application. It's not a MS Office specific issue.

@KamilMaciorowski Good point, I'll give it a thought, thanks!

@CaldeiraG interesting, where did you get the information that eg. Office 2019 does have Microsoft in it's name and Office 365 doesn't? I can find any differences on Microsoft's website?!

@Mokubai that what I though at first, but they are not. The shared(!) top level function like formulas features in excel etc. might be overall similar (but details are still differences), and they don't share all functions. Further in depth the differences get bigger due to fundamental differences on how apps are implemented into windows (in regards to "regular desktop applications").

Thanks for you thorough answer. You raised some good points, I will take them under advisement. By now the question was reopend again without my intervention. Some final thoughts: If one of the question has to be closed, the reason behind the closure would be the most compelling reason not to close my question, since it leads exactly to the opposite (it will force further answers on specific activation methods to be written in a different place from where most of them are)

@DavidPostill ok, I hope I got it, anyway I posted my followup question here.I'll be happe if you would participate.