I have been using Skype for a couple of years, first on Windows and now on MAC. although the windows version has more bells and whistles, the MAC version does what it needs to.
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There are two challenges that I face with the MAC version is that it will crash from time to time and when it does, you need to reload it and enter your user name and password. I have it set to boot when I turn my computer on, so if I decide to reboot rather than enter my info, it will insert the info on its own when I reboot.
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The second challenge is this: I have my SKYPE set to answer incoming calls automatically. When I am on a Voice call and another call comes in Skype puts the original call on hold and connects with the new call. That feature really needs to be fixed, because it has the potential of cause me an embarrassing moment or giving information to the wrong person.
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I like the privacy features and the quality of the sound. The other thing I like is by being on line, it eliminates the time zone and if I am only line at 11 am and someone from AU wants to talk to me at 11 Pm their time, we can communicate as if it was the same time in both places.
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I recommend SKYPE daily to my friends and business clients. I only wish that they would add the features that they have developed for windows users for us MAC folk.