Here are few reasons for switching your email service (for your small business/personal domains) to Google apps.
1. Google is very reputed and trusted company
- check their company profile
2. Email component in Google Apps platform is Gmail
- the best available in the market, Web 2.0 platform
- IMAP and Pop3 access are free
- mobile version is also included
3. Google apps is built using massive distributed infrastructure
- great reliability
- huge mailbox, never have to delete any email
4. Better SPAM handling
- best spam flagging (lesser false spam)
- better delivery chances for legitimate email sender
5. Standard edition is free, enterprise is cheap
- free is great for non-profit, small business and webmasters
- enterprise edition is cheaper than owning your own infrastructure