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  2. Gmail - Wikipedia

    Gmail is a free email service provided by Google.As of 2019, it had 1.5 billion active users worldwide. A user typically accesses Gmail in a web browser or the official mobile app.

  3. Comparison of cross-platform instant messaging clients

    Phone number No No No Signal: Phone number; iOS or Android device: Yes No No Yes: No Silent Phone: No Yes No No No Skype: Email, Microsoft account Yes No No No Slack: Email Yes No No No Snapchat: Email or Phone number Yes Yes No No No Surespot: No No No No No TeamNote: Telegram: Phone number; iOS or Android device: Yes No No No No Tencent QQ ...

  4. Public switched telephone network - Wikipedia

    The technical operation of the PSTN adheres to the standards created by the ITU-T. These standards allow different networks in different countries to interconnect seamlessly. The E.163 and E.164 standards provide a single global address space for telephone numbers.

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  6. Windows 7 - Wikipedia

    Until April 9, 2013, Windows 7 original release includes updates and technical support, after which installation of Service Pack 1 is required for users to receive support and updates. Windows 7's server counterpart, Windows Server 2008 R2, was released at the same time.

  7. Pretty Good Privacy - Wikipedia

    Additionally, a number of Desktop bundles are also available. Depending on the application, the products feature desktop e-mail, digital signatures, IM security, whole disk encryption, file, and folder security, encrypted self-extracting archives, and secure shredding of deleted files. Capabilities are licensed in different ways depending on ...

  8. Computer virus - Wikipedia

    A computer virus is a type of computer program that, when executed, replicates itself by modifying other computer programs and inserting its own code. If this replication succeeds, the affected areas are then said to be "infected" with a computer virus, a metaphor derived from biological viruses.