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Skype issued a hotfix for its VoIP software containing a bug that could result in instant messages (IMs) going out to unintended recipients.

Skype developers created hotfixes for the Windows, Mac OS X and Linux Skype clients. The new updates – Skype for Windows, Skype for Mac, and Skype for Linux fix the privacy bug that plagued some users. They also corrected a problem related to saving files to drives formatted as FAT32.

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The privacy bug first saw the light of day in the Skype Support Network forums by a user who, after an update to their Skype client last month, encountered the problem in which some of their messages went to another contact. Following this report, a number of other users also confirmed having experienced the problem.

The privacy problem only occurs following a crash of a user’s Skype client during an IM session, Skype said. When the client restarts or logs in as a new user, IM messages entered or sent prior to the crash can, in some cases, go out to a different IM contact in the user’s list. While the company said it was not able to determine how many users suffered from the error, it went on to say it only happens in “very rare cases.”

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At first Skype said affected clients include version 5.9 and 5.10 for Windows, Skype 5.8 for Mac OS X, Skype 4.0 for Linux, Skype 4.0 for iOS, Skype 2.8 for Android and Skype 1.2 for Windows Phone.

However, upon further review Skype for Windows 5.9, Skype 4.0 for iOS and Skype 2.8 for Android did not suffer from the issue.

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