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bugoyboy Level 1 Level 1

I use my iPhone 4S calendar as my primary calendar for entering or modifying events for the simple reason that it's with me most, if not all the time.


But after upgrading my MacBook Air to Mountain Lion last week, calendar entries entered or modified on my iPhone no longer synchronize with the calendar on my MacBook Air.  As such, I have to manually make the entries or modifications on my MacBook Air so that the calendar will be updated when I synchronize it with my iPad.  Am not using iCloud, so the calendar on my MacBook is a local calendar (On My Mac).


Any thoughts on why this is happening and what can I do to fix this?

MacBook Air, OS X Mountain Lion
  • millwoodroad Level 1 Level 1

    Have thrown away a few hours on this identical problem today.  Timing coincides with mountain lion upgrade exactly.  have noticed contacts have no issues.  have removed all calendars, brought them back...nothing.  i changed the name of the calendar i was trying to sync (changed it on the iphone via settings).  this change did change the calendar name in the iTunes software (where you indicate which calendars you want to sync with) but not Calendar software itself.  So it is not a 'checkbox' issue (picking the wrong calendar to sync) nor is it an iCloud issue (as i'm only syncing with the local macbook air).


    Not being able to use my calendar is a major issue.

  • James Howard Level 1 Level 1

    I have noticed a problem recently, although I can't absolutely be sure it's related to Mountain Lion on the computer.   Perhaps iCloud (which I set up, but am not really using yet).


    My specific issue is that if I go into Calendar (formerly iCal) on the mac, and edit an already existing calendar event -- change the time, or move it to another day -- the change doesn't always sync through to the iphone properly.


    Example: I had a recurring weekly event for 7:pm on a specific day of the week.  The start time got pushed back to 7:30.  I changed it on the mac, and sync'd to the phone.   However, the change did not get applied to the iphone calendar.  If I edit it on the iphone itself, it will sync back the other way correctly.


    Same sort of problem occurs if I move an event from one day to another on the mac.  I will wind up with it showing up on BOTH days on the iphone.  If I delete an item, same thing.


    It acts like the iphone versions of calendar entries are write-protected in a way.  If I edit them on the phone, the changes stick and sync properly to the mac.  If I try to do it the other way around, they do not.

  • ckuan Level 7 Level 7

    You need to use iCloud for the calendar to sync across all you devices.

    iCloud: Calendar overview

  • James Howard Level 1 Level 1

    Sounds like I'm doomed then for now.  I have an iphone 3, and I can't even install the version of iOS that supports iCloud on that phone.   And I'm in a contract, and can't upgrade for several more months.


    This is broken.  It sounds like I have to reinstall an older version of OS X on my mac to get my calendar to work again like it did before the mountain lion upgrade.

  • ckuan Level 7 Level 7

    The iPhone 3G can only go up to IOS 4.2.1. Yes, you are correct that it does not support iCloud, only iPhone 3GS and up.

  • o7oleg Level 1 Level 1

    I had Mountain Lion and everything worked fine until I updated my iphone to iOS 6... Now all the changes from the calendar on my mac synced with my iphone fine but changes made on my iphone are staying there without going through back to my mac...

  • DaveDaveDave Level 1 Level 1

    I am experiencing exactly the same problem. I am using OS/X 10.6.8 on my iMac and iOS 6.0 on my iPhone 4S. Synchronization is now only one-way. Clearly a regression bug introduced with iOS 6.0.

  • chrisfromgastonia Level 5 Level 5

    Do you have icloud turned on in your mac in calenders, preferences, accounts? And do you have the shared data alerts on in mail/calenders on your phone and icloud on for calenders on your phone?

  • DaveDaveDave Level 1 Level 1

    As stated, I am using OS/X 10.6.8 which to my knowledge does not have or support iCloud. 10.7.4 is required. I am not using iCloud on any devices. I never used to have to do so in order to synchronize my calendars. I checked my iPhone Settings and iCloud is off. I do not want to upgrade my iMac because newer versions of the OS no longer support OS/9 and I still use some apps in compatibility mode.

  • Chrix06 Level 1 Level 1

    Same problem for me


    Since my upgrade to Mountain Lion, impossible to synchronize local calendars from my iMac to my iPhone 4S (iOS 6).


    What's the **** ???

  • Negatetime Level 1 Level 1

    Yup, same issue here with an iPhone 4 and ML.  Just noticed it today and I updated to ML two weeks ago. Events made on my Mini are not going to my iPhone and events made on my iPhone are not going to my Mini. Oh by the way, I don't use iCloud.

  • ckuan Level 7 Level 7

    If you don't use iCloud, that's why it doesn't worked.

  • o7oleg Level 1 Level 1

    iCloud rather adds problems than solves them. It doesn't help, I checked it.

  • ckuan Level 7 Level 7

    Mine is working perfectly. iCloud Calendar sync with my iPad, iPhones and iPods.

    Also the dedicated calendars I've assigned for my wife, son and daughter school calendar on their iPods and iPhones.

    There must be something wrong with your configurations and assertions.

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