Office 365 - What hardware and software is required to take full advantage of Office 365 for email and calendaring?

For PC users:
The system requirements for Office 365 are:

• Windows 8, Windows 7, Windows Vista SP2, or Windows XP SP3;
• Office 2007 and later; and
• Internet Explorer 8 or above.

For Mac users:
The system requirements for Office 365 are:

• Mac OS X 10.5 (Leopard); 10.6 (Snow Leopard), or 10.7 (Lion);
• Office 2011 for Mac; and
• Safari 5 or above.