Microsoft offers a Web Portal, or integration into your Outlook app, as well as the ability to sync your Onedrive with Windows File Explorer.
There are many useful tools that you can add-on such as To-Do, a note taking app that can sync with android phones and where you can flag emails to show up in a to do list; Boomerang, which can resend emails to the top of your inbox when you want it or you can schedule emails to send to your contacts at a later time; Skype for Business, and many more. With all of the functionality these add-ons bring, all of the basics are covered in the apps that are already included such as Outlook, Word & Excel & the other apps (online apps), Calendar, Onedrive, SharePoint (or Sites), Teams. The online versions of Word, Excel, PowerPoint, & Publisher do have limited functionality, but most business level subscriptions also provides access to the desktop apps where your files will sync real time. There is no longer a reason to download documents, edit, and resend to everyone else who needs to edit info. If you're accounts are all synced, those files will remain intact. Multiple people can work on them at the same time and changes with be automatically synced and saved.
There have been many updates to the look, feel, and general usability of OneDrive and SharePoint. SharePoint lacks some organization and doesn't always accurately show who uploaded, or edited documents. OneDrive is a great tool for saving all your files to the cloud, however, when others share files with just you, you are not given the function to sort, or organize this section, making it hard to find live files.