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How are these apps (on the Ipad) in comparison to the desktop Win10 versions?
The iOS version of MS Office is some ways on par (and other ways sub par) with Google Docs. It does a great job in displaying MS Office documents, and does a decent job in allowing modification of documents with moderate/advanced formatting, but it is not capable of CREATING documents with moderate/advanced formatting. If you use custom fonts, you'll need to install something like AnyFonts on the iPad (and install those fonts) to preserve the appearance on the iPad.

I much prefer the web version of MS Office. It is far, far more capable... and I use the web version whenever I have internet access. It works pretty well on the iPad, but really shines on chromebooks.
 
The iOS version of MS Office is some ways on par (and other ways sub par) with Google Docs. It does a great job in displaying MS Office documents, and does a decent job in allowing modification of documents with moderate/advanced formatting, but it is not capable of CREATING documents with moderate/advanced formatting. If you use custom fonts, you'll need to install something like AnyFonts on the iPad (and install those fonts) to preserve the appearance on the iPad.

I much prefer the web version of MS Office. It is far, far more capable... and I use the web version whenever I have internet access. It works pretty well on the iPad, but really shines on chromebooks.

Thank you!
 
Word has been quite good on the iPad for a long time, but I use OneNote far more than Word these days. OneNote is great on the iPad. Excel is more of a challenge to use on a touchscreen device, but doable. I open Excel frequently in meetings so I have some data to refer to, but if I need to do quite a bit of editing or data manipulation in Excel, I’d rather use my desktop computer.

As others have said, the web based versions have more features, but the app versions offer convenience and ease of access. The desktop versions still have the most features, but Microsoft has been steadily improving the Web apps to the point where the differences might not be obvious to the casual user. Outlook is one application where the Web version has surpassed the desktop version in some ways, but still lags in others. OneNote is now primarily a Web app with the option of apps for Windows, MacOS, iOS, and Android.

Excel is tops when it comes to spreadsheets, there are many alternatives to Word depending on what your final products are. Our Office environment uses OneNote far more than Word these days. There are also many mobile centric word processor and note taking tools, including Google Docs, Google Keep, Simplenote, Evernote, Notability, and more. Just depends on what your needs are, but personally Word wouldn’t be my first choice unless I’m in an Office 365 environment where that is expected. Even then Word would be my second choice behind OneNote (which can export to Word).
 
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