Users can now create documents and use a number of new edit features in the new apps, without the need for an Office 365 account. 

Dropbox support has been integrated. Other cloud options are bare-bones, but Microsoft's own OneDrive is included.

Some documents are read-only unless you sign in with a Microsoft account. But that doesn't have to be tied to a paying subscription of Office 365. 

The new opened-up editing features makes the app accessible to millions of its existing customers, who before had very basic editing capabilities. Users without a paying Office 365 subscription weren't able to create new documents on the go.

Nearly everything you might need in a Word document, you now have on your iPhone or iPad. From highlighting to font changes, review and track changes, and even inserting tables and pictures — it's a pretty comprehensive productivity suite for mobile.

Users can now create documents without a paying Office 365 account. However, it's easier editing and tweaking than composing documents on the go, due to the display limitations (even in the larger iPhone 6).

The Word app has a tendency to want to display the full text all of the time. You can, however, go into a draft-style mode which wraps the text — making it easier to read.

You can easily set the font size so it scales up and down, without missing text that's fallen off the edge of the screen.

Almost every feature you will ever need is here. Bets are placed on at least 95 percent of Office users will have everything they want and need in a document processor.

You can even add collaborators to your documents, and make review and edit changes, allowing you to track what's been changed in future revisions.

All of the other handy features, like word count, are buried away in the various menus at the bottom of the screen.

Excel is a pleasure to use, with a fluid interface and unjarring scrolling. It works ideally in landscape mode, but portrait works well for long listed items.

Like Word, you can import files and worksheets from Dropbox. You can pan and zoom in easily, and edit individual cells with a simple tap.

Users with complicated (or even simple) worksheets can now add charts and tables to their Excel spreadsheets with a tap of a button — without the need for a subscribing Office 365 account.

You can shift and drag around charts, scale them, zoom in, and embed them exactly where you want to.

PowerPoint acts almost exactly like it does on the desktop. It's always been relatively easy to use, but because of the smaller display it's better for editing rather than full-on presentation creation.

You can do the vast majority of what you might need to do on the iPhone version, like adding new slides and editing text.

Where's the keyboard...?

For those truly embracing "death by PowerPoint," you can always add transitions and effects to your presentations on the fly using the iPhone app.

The best part about the app is you can AirPlay your display over to a compatible Apple TV or other device and give the presentation you just created (or edited).