Calendar not syncing after mountain lion install on iMac

Installed mountain lion on my imac. entered calendar event on my iphone and have never had problems with imac and iphone syncing. now, when i did a hard sync from iphone to imac, calendar event didn't transfer. I tried to trouble shoot and did the reverse way - imac to iphone with a dummy calendar event - that didn't transfer either.
please advise what might be going on...
thanks

My iMac has updated to mountain lion and also get the same issues. Then I try the tip from
http://www.soyo123.com/2012/08/clockcalendar-widgets-missing-after.html and that fix the issues

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Do these resets to clear errant commands:
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.
PRAM RESET
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Shut down the computer.
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Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
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After installing Mountain Lion on my 13" MacBook Pro the Calendar widget is missing and I can't find it nor put it back on the dashboard.

My iMac has updated to mountain lion and also get the same issues. Then I try the tip from
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I'm putting this discussion again because the problem didn't solve like I thought !
As you can see from the title that I have a problem already after I installed the new OS X Mountain Lion. I got my thunderbolt to Hdmi adabtor connected to an LCD TV and it was working great with snow lepord. But after the I installed Mountain Lion. it won't even recognize that there is something connected and I don't see the options in my System Prefrences> Diplays like before.
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Well I would have hit repair. This might be stemming from a deeper issue with the installation. I've never seen that dialogue box before, and if ignoring it and booting normally worked for you then I say you did the right thing.
however
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Well I can have a go at answering you questions
Is it necessary to upgrade to OSX Server if I wish to use the server a Time Machine target for Mabooks running Mountain Lion?
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If I do upgrade to OSX Server, is it also necessary to upgrade all the Macbooks to Mountain Lion?
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For the server app, you have to run the same version across the server and the client to use it, you can always use screen share to get to the server and run the server app directly on the server. This is what I do when using a 10.7.4 client.
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Quit Mail. Force quit if necessary.
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Well I would have hit repair. This might be stemming from a deeper issue with the installation. I've never seen that dialogue box before, and if ignoring it and booting normally worked for you then I say you did the right thing.
however
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Calendar not syncing after mountain lion install on iMac

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