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Document Format (PDF).[3] All members of the family, except Adobe Reader (formerly
Acrobat Reader), are commercial software; Adobe Reader however, is available as freeware
and can be downloaded from Adobe's web site. Adobe Reader enables users to view and
print PDF files but has negligible PDF creation capabilities. [4] Acrobat and Reader are widely
used as a way to present information with a fixed layout similar to a paper publication.
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Mozilla Thunderbird： Mozilla Thunderbird is the safe, fast email client that's
easy to use. It has lots of great features including quick message search, customizable
views, support for IMAP/POP, RSS support and more. Plus, the portable version leaves no
personal information behind on the machine you run it on, so you can take your email and
adress book with you wherever you go.