IPAD2 calendar lost all data after 5.1 upgrade

I just upgraded my iPad via iTunes to v5.1 today, and just like my upgrade previously to 5.01, my calendar lost all data. Somehow, I think I was able to recall the data under 5.01 whereby it just magically came back. I don't remember how it came back. How do I get my calendar data back??

1). Re how are u syncing calendar. And "info" : answer: the entire "sync calendars with .....". Box is all gray. When I click a check to the left of Sync, the Outlook field comes alive, and no other choices in that drop down field.
"All calendars" is radio buttoned, and Do not sync events older tha .30. days ischecked.
I'll now leave it like that but since I don't use OUTLOOK on mt laptop I don't see how it wll affect anything .
Further own on th screen, under ADVANCED, checking Calendars. Apparently willrlac "the selected information in this iPad with information from this omputer". I don't know how to interpret this, do you? If I check it it will get information form the computer ? What info? A previous cal data file?
2). Re page 70. If you had not told me (sent a ref URL in one of u'r replies tonite), I wouldn't have even known about the iPad 5.1 manual.
Pager 70 : I read pg 70 and don't see any related advice.
In the meantime, no data, just like the last upgrade problem. Since this is exclusively related to calendar, I must conclude whatever events file that existed was lost in the process. Although the US, FRENCH, AND GERMAN HOLIDAYS DID GET TRANSFERRED! And a recurring event file also (time card every Friday)
Ideas?

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IPAD2 calendar lost all data after 5.1 upgrade

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