For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Roundcube - Web-based IMAP email client
Dropbox - Online Sync and File Sharing
HEY - Email at its best, new from Basecamp.
Google Drive - Access and sync your files anywhere
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Mega - Secure File Storage and collaboration