Gmail

Free

Specifications

Features
Email organization: Colored labels (tags); can apply multiple labels to emails
Search emails: Yes
Automatic inbox organization: Conversations (Threads)
Automatically sort incoming email into folders: Can automatically sort by labels
Nested folders?: N/A
Contextual right-click menu: No
Integration with social networks: Yes
Undo send: Yes, within 30 seconds
Vacation auto-responder?: Yes
Quick-add pane: No
Disposable address option: No
Email stationery options: Emoticons
Create contact groups (distribution lists): Yes
Multiple inbox option: Yes
Customized for mobile: Yes
Customized for tablet: Yes
POP3: Yes
UPC: N/A
MPN: N/A
IMAP: Yes
SMTP: Yes
Storage limit: 7 GB and increasing
Attachment size limit: 25 MB
Ads: Text ads with received email (based on email content) and on top of inbox, not sent email
Browsers supported: Chrome, Firefox, IE, Safari
Deactivation Period (if not logged in): 9 months
Automatic forwarding: Yes
Secure SSL: Yes
Instant messaging integration: Yes
Integration of text messaging to cell phones: Yes
Built-in audio player: Yes
Built-in voice calls: Yes
Pulls in email from other accounts: Yes
Virus scanning: Yes
Spam filters: Yes
Steps from log-in to inbox: One
Calendar integration: Yes
RSS feed integration: Yes
Map integration: Automatic links from addresses in emails to map
Custom sending address: Yes
Domain name customization: Yes
Mobile version: Yes
Offline version (synchronized with online version): Yes (optional)
Interface: Unusual
Preview pane: No; snippet only
Previews inside messages: Audio, video (You-Tube), PDF, images (Picasa, Flickr)
Tabs to open more than one message: Yes
Customized display: Yes, including colors
Switch easily between accounts: Yes