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POP3 and IMAP support
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Thunderbird, Outlook, and other desktop client suport
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Drag-&-drop message management
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Full support for MIME and HTML messages
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Multiple sender identities
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Full featured address book
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Find-as-you-type address book integration
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Threaded message listing
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Spell checking
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Responsive skin (multi-device support)
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Shared/global IMAP folders
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Support for access control lists (ACL)
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Built-in caching for fast web mailbox access