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If I were to ever end up stranded on a desert island, I would have a near-unlimited supply of ibuprofen. There's nothing worse than being in a foreign country and either not speaking the language or know where you're going with a headache so heavy that it could kill a small elephant.
My personal trouble is that I suffer with Tourette's syndrome. Dozens of times a day, I violently twitch my head which not only strains my neck and back muscles but also often results in an excruciating headache. My cure: ibuprofen, because for some reasons paracetamol doesn't quite take the edge off.
Not very techy, one might think. On two fronts, I keep this with me at all times in my on-the-go bag because without it I can't get on a flight to where I need to be. That's a given -- sure -- but it also acts as age identification for when I'm abroad. Some countries still have antiquated laws when it comes to buying over-the-counter drugs, such as headache tablets, or buying liquor.
The more interesting part is the chip in the back of the passport. Where it has my nationality and pretty mugshot, the plastic laminated chip-laden page allows me to walk back through the U.K. border using e-passport gates -- unmanned, automated barriers to re-enter the country -- which is particularly useful during peak-times, such as the Olympics.
Microsoft Office 2011 (Mac)
It's far from an ideal solution considering it crashes at least once a day, but it's still the best service for me. I run an Office 365 (Exchange 2010) cloud email solution (see later). While my Mac's in-built email program, Mail, is compatible with Exchange it doesn't support the full range of Exchange features.
Again, it's down to what you know best. There are other email programs and solutions out there, but I've always trusted Microsoft software -- even when it's on a Mac -- and with my decade-long experience of using Windows, a Microsoft-powered solution is what I know best and I'm not one to make radical changes to my workflow.
Sometimes it's a matter of taste and nothing more.