Keeping up with your appointments doesn't have to be limited to your desktop computer's Windows Calendar. You can transfer the appointments saved in Windows Calendar on your computer to your iPhone to allow access to your important calendar dates with you at all times.

Track important dates on both your Windows desktop and your iPhone.
Step
Connect your iPhone to your computer with the iPhone's USB cable.
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Open iTunes and select your iPhone device from the source list (the column on the left side of the window).
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Click the "Info" tab at the top of the screen when the "More Info" screen appears.
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Select "Sync Outlook Calendars."
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Click "Apply" in the bottom-right corner of the screen.
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Click "Eject" next to your iPhone device's name when the sync is complete.