Calendar sync

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http://androidforums.com – Hello! I just got into the world of Android by buying a tablet a few days ago. Needless to say, I still have a lot of things to learn about it... one thing that is baffling me is the fact that, in order to use the tablet's calendar, I am supposed to get a pfx or p12 extension file I can't find anywhere on the www. I guess this is also a question of synchronization... I have added a gmail account and toggled on the sync features but still I am making no progress whatsoever. Can anyone give me a hand with this please (explained to a complete newbie in these matters)? Thanks in advance, (General)