Disappearing Calendar Entries

Since upgradding to Mountain Lion, I have been having Calendar entries occasionally vanishing or being modified on their own. The event will go from one with specific times for start/stop to categorized as an all day item. The calendar category can change (eg. from "Work" to "Home"). or it can completely vanish without any intervention by me. There are no other users with access to this account.
Anyone know of any reason why this may be happening or what I can do to prevent this?
Thanks in advance...

OK, I have determined that the events are not disappearing, but rather, they are not all syncing between my devices. The odd thing is that some items sync and others do not. They are all in one of my iCloud calendars.
Any thoughts on this?
Thanks!

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*If disappearing calendar entries are added back via the desktop Outlook, it accepts but then it displays that appointment TWICE on the phone.
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There are other employees who use their phone to sync with our server for their e-mail, contacts and calendar. All of those are still working fine. None of them however, are using Windows Mobile 6 Professional. One employee is using Windows Mobile 6.1 Professional and she can't tell that she is having any problems.
Valerie Wilson
Post relates to: Treo 750 (AT&T)

This issue might be a bit complicated. I would suggest posting in the Microsoft forums at http://forums.microsoft.com/windowsmobile
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Once I updated to OS 6 all my calendar entries from early in the year have disappeared. I need them as a reference and record of activities how do I restore them?

Once I updated to OS 6 all my Calendar entries from the early part of the year disappeared. I need them as a record of PD activities how do I restore the earlier entries. The new future activities are there just the old ones have disappeared.

Well, that would depend on what calendar you are using.
If you are simply relying on the calendar on the device, well, that's not very smart. Restoring from backup should put everything back.
If the calendar is synced with another service, like Google, iCloud, Exchange, do the entires still exist there?
If the calendar is synced with Outlook or iCal on your computer, do the entries still exist there?

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After recently updating to 7.1.2, all of my past calendar entries for 22014 disappeared and I cannot add new entries??

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Then, close out all the running apps on your device, and restart it.
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I have a BB Pearl 8100 and have the problem that calendar entries disappear from the device. Entries as recent as those from the previous week all of a sudden disappear. I have re-synchronized several times (I use Outlook 2003 for calendar and contacts), and the entries stay in the device for a few days but after a week or so, all past appointments, except the recurring ones, just disappear. I don't have a problem with contacts, and I don't synchronize emails, so the issue is only Calendar.
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yes it is annoying and I know a few that moved to outlook.com and use Exchange Active Sync so you dont have to deal with cardDav, CalDav IMAP and SMTP server isssues. You can also get an outlook plugin and sync with outlook program on a PC
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I use the calendar on both the iPhone and iCal on Mac OS X and have them synced. This works fine except for one thing. Old calendar entries (over a month ago) are deleted when I sync.
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Why do I now have to turn on iCloud in order to add entries to my Calendar? I didn't have that limitation before upgrading to IOS 7.1. All of my calendar entries that I had before have also disappeared.

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You don't have to turn on iCloud to use the calendar app. Only if you wish to sync to iCloud. However, if it was previously being used, and was turned off, that would cause you to lose those entries on the device. Turning it back on should recover them if they have no been deleted for some reason.
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Hi!
Got my Z3 Compact a month ago.
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Do you know which calendar these entries were stored in? For example Google calendar, device calendar, ActiveSync calendar? If you have removed an account, all entries that belongs to that account will be removed as well.
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Hi
I am using Palm Desktop 4.1.4 not connected to any thing. Win XP 32 bit SP3.
Recent calendar entries (since Mid Feb 2012) disappeared. I reentered them and checked a few times and they were still there. Then several hours later they disappeared again. Only recently entered calendar entries disappeared.
• There is only one user.
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Hi cygnusX1
Thanks a lot for responding.
I don't believe the Palm Desktop stayed open when the data was found missing. I believe I had closed it and then found the data missng upon reopening it...but I'm not perfectly sure about that.
Since I posted, I testing it again by entering 3 dates in Feb and March 2012. I check a few hours later and the dates were still there, even after closing the PD and reopening it a few times...then the next day, the newly entered dates were gone. All other existing data that was entered in the Calendar, Contacts etc seems to be uneffected.
==================================
I just made the following observation:
==================================
It seems as though only data that was entered from Jan 1st 2012 and onward, is disappearing. Contact data entered from Jan 1st 2012 and onward, has also disappeared. In the contact data, I made a change to an existing record in Jan 2012 and the original record is there but the change I made has disappeeared.
There is existing data in the year 2012 calendar that was entered before Dec 31 and that data is still there as well as all previous data.
As far as your suggestion to export data, uninstall and reinstall, I will try that as soon as this post runs it course. I want to wait to see if any solution appear in the short term. Then, if the reinstall does not help, I guess I will have to consider a different Calendar and Datebook app.
I would like to know what is going on. This seems very strange. It's never happened before. Been using this app for many years.
Thanks again for any help

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I've confirmed that Calendar is using the correct calendar ([email protected]), hit the 'reload' swirly arrow and I can see activity on my router for a few seconds, but, nada.
I use Google 2 step but it works for everything else and I can't think this means anything.
What am I missing??

Never mind, I added a random calendar entry and everything immediately reappeared.
Computer science is a wonderful thing

Disappearing Calendar Entries

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