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Related Clues:
- Online service that can connect to Hangouts
- Communication service since 2004
- Google's message service
- Service with more than a billion users
- Google's messaging service
- Alternative to AOL
- Online service offering free addresses
- Popular Google service
- Service launched on April Fool's Day in 2004
- Its logo is an envelope
- Online service introduced in 2004
- Service with more than 1.5 billion users
- Its logo has a blue, red, orange, yellow and green 'M'
- Web service since 1993
- Competitor of Outlook