The Mail module is also webmail and mobile client. It has a business value, cause it’s possible to relate and convert an email in an another business module. It’s multi-accounts and IMAP. It’s everytime possible to “talk” about an email internally at your team avoiding any forwarding.
The Organizations module manages all the information related to the different organizations that you get in contact during the business activities of your team. It can include: customers, potential customers, stakeholders, partners and many more.