Many companies today share files by saving to a shared resource -- a server or NAS device -- or use a cloud-based service like DropBox. Some just use email. Since Office 365 files are automatically stored in SkyDrive, Microsoft's cloud-based storage service, expect a learning curve. It's not hard, it's just different, and it will take some getting used to by parties on all sides. All of Microsoft's subscription- based Office 365 versions include 25 GB of SkyDrive storage (and all but the $4 and $8 versions can edit files online).
People using Office 2013 with a free SkyDrive account get 7 GB of storage but must switch to a browser to edit those documents online. While Office 2013 integrates with SkyDrive for online file storage, it doesn't support online editing. Editing Office 2013 documents online requires the Office Web Apps browser add-on, which also helps facilitate sharing by emailing or posting links on social sites.