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I had to reinstall my os and when installing T-bird my saved inportant dates in the calender were missing, how can I get them back?

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I had to reinstall my os and when installing T-bird my saved inportant dates in the calender were missing, how can I get them back?

I had to reinstall my os and when installing T-bird my saved inportant dates in the calender were missing, how can I get them back?

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From the backup you made before messing with your operating system.