I can't upgrade to Windows 10. I have tried every single possible method I can find to avoid the C1900101-40017 error on upgrade and every method has failed. i have unplugged everything, I have booted from recovery move, I deleted all unused drivers, I have upgraded everything, multiple time, I have restored and repaired Windows and still get this error.

I have sent Microsoft emails about this, and the only reply references me to the things I have already tried.

Now you won't allow me to use new Excel features because your upgrades don't work despite trying everything. How fair is that?

My tabs are invisible due to a clear bug. I can double click in the grey space below the worksheet where the tabs should show, and then change the randomly clicked tabs' name. This also changes the view to the randomly clicked worksheet. But with 11 sheets that were visible when I made the book yesterday, I do not want to randomly find the right sheet. Takes too long.
- closing and reopening the workbook does not help
- other workbooks in the same excel instance do show their tabs
- a macro warning appears when opening book and i do enable the macros - i need them.

note: all these suggestions below have been verified and obviously to no resolve because this is clearly a bug.
- options: show tabs is on.
- zoom factor is 100%
- scroll bar is small and to the right of the sheet
- windows are maximized

A Table has a lot more functionality than a List. Although there are 6 different ways of converting a List into a Table, Excel users find it easy to do that with a shortcut. Surprisingly there are 2 shortcuts performing the same exact task:
CTRL + T (T stands for Table) or CTRL + L (L stands for List)
Why should we reserve 2 shortcuts for the same action? let's keep only the relatively new one CTRL + T (users are familiar with this one)
While Assign the older shortcut CTRL + L to copying to the left (L stands for Left) maintaining the same logical association:
CTRL + D >> To copy Down (D stands for Down)
CTRL + R >> Copy To The Right (R stands for Right)
CTRL + L >> To copy to the Left (L stands for Left)

I know that the Taskbar is a Windows issue.
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But the way Office applications start and run is entirely an Office Issue. I want to know why Office 2010 and 365 work differently on the taskbar.
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I've had too many cases when a file causes an application crash. If I have multiple files open in the same session, all of the documents are lost. Hence work is lost (regardless of the save options (and no I prefer not to use OneDrive) ). So I prefer to open documents and spreadsheets in separate windows sessions.
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When I pin an Office 2010 tile to the taskbar, I can open the application separate Windows sessions.
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When I pin an Office 2016 tile to the taskbar, the shortcut always uses the same session. Using the <WIN><#> shortcut or clicking on the tile just toggles display of the application window.

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Both applications have a startup parameter that will start the application in a separate session (/x for Excel and /w for Word). When I use a shortcut on the desktop or use the Run dialog with these parameters, both Word and Excel 365 start in separate Windows sessions.

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Even if I put the parameter in the taskbar tile, the taskbar always only works with a single windows session.

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Eh?!

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Why do 365 tiles/shortcuts on the taskbar work differently than the run dialog and desktop shortcuts.

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Is there any way to beat the taskbar into submission? Another parameter?

My users often use the calculator to take care of simple calculations. Using Excel, in contrast, lets our users experience the breadth of depth of the incredible program Excel is. Unfortunately each user prefers the calculator because it's so much faster and our keyboards have a button for it.

If we could have a pocket version of Excel that could used for quick and simple calculations, we would really appreciate it.
Here's how we envision it would look:
A grid of cells (5 rows by 12 columns) that can only be interacted with the keyboard. Functions can certainly be used and the function bar can be seen. There can't be any sheets added - if you want something more robust, go use the original Excel.