The Official Outlook Solution for Android: Outlook
Access email and calendar.
Works with Exchange server.
Requires a Microsoft service to sync calendar.

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Outlook for Android aims to provide a more streamlined Outlook experience than the full PC version.
Best Free Cloud Calendar for Android: Google Calendar
Sync to built-in Android Calendar app.
Integrates with Google Assistant.

Simple and clean interface.
Googles own Calendar app is best integrated with Android.
One key weakness is the lack of categories for tasks.

or Wheres my next event?
you might also ask the assistant to schedule and add events.
Best Scanner App for Android: CamScanner
Very easy to use.

Corrects alignment and perspective.
Recognizes text (OCR).
Can sync documents with Evernote, Google Drive, Dropbox and OneDrive.

Lots of pop-ups in free version.
Need to pay for sync.
Need to pay for OCR.

For this to work in an ideal manner, the scanning process needs to be quick and easy.
Free Cloud-Based Word Processing on Android: Google Docs
Tight integration with Android.
Great for working on collaborative documents.

No cross-references to captions.
Missing basic word processing functionality.
If you need a basic word processor,Google Docscan do a good job.

However, dont expect it to replace Microsoft Word.
Docs isnt suitable for producing large complex documents, as it lacks features like captions and cross-references.
Also, unlike Word for Android, you cant edit equations in the Android version.

Best Free Personal Organizer App: DejaOffice
Access all your Outlook data.
Today widget to view upcoming appointments.
Shortcuts to edit specific memos.
Shortcuts to call favorite contacts.
Paying to sync our data.
Extra cost for cloud sync.
you might also create a shortcut that takes you from the home screen straight into editing any memo.
Best Android Productivity App to Edit Word Documents: Word
Interface that works on small screens.
Sync documents with OneDrive or Dropbox.
Edit styles and equations.
Preserves as captions and cross-references.
Track Changes isnt reliable.
You cant add captions and cross references.
A common use for Word for Android is to review documents received by email.
This is where the app has some issues.
Although it has a Track Changes option, it doesnt always work reliably.
Best Productivity App to Make Checklists: Listing it!
Hierarchies with many layers.
Simple text import and export.
is convenient and flexible, with powerful import and export features, while being quick and easy to use.
Cloud-Based Notes: Google Keep
Simple visual note taking.
Set reminders by time or location.
Locations must be a single location.
Whats even more surprising is Google Assistant cant be set to take and save notes in Keep.