iPhone not syncing all exchange calendar events

I posted in another thread about this. THis worked for us.

On the iOS device:

• Navigate to Settings app > Mail, Contacts, Calendar.

• Scroll down and locate the Calendar section

• Tap Sync (under the Calendars section)

• Set the interval to All Events

• Close the Settings app (Tap Home button)

I suggest rebooting the iOS device. Check the calendar and let it sync – look for those missing events.

I've seen Outlook client side caching cause issues like this...the *.ost file can get "messed up". For testing, I'd delete the *.ost file on the users pc and turn off cache mode....you might also try, after deleting the *.ost file and turning off cache mode, turning caching back on and letting the *.ost file be rebuilt...if it doesn't fix the phone immediately, I bet if you removed Outlook from the phone and re-added it(subsequent to working on caching), it would fix it...hope this helps...

Thanks for posting this, Michael. I was experienceing the same thing on all my decvices. I had tried your first solution (to remove the account and reinstall) but I had no luck. Your second solution of changing the interval to All Events worked brilliantly. Thanks again!

I take it back....not working again. From doing some reading, it looks like it could be on the Exchange server side of things. We're running ExchangeServer 2003. I'm a little hesitant to go poking around in that box. So I may have make a manual work around on this one.

We've found, too, that the type of calendar item can make a difference..as an example, a changed instance of a recurring appointment can be a problem..it has to do with the way Exchange handles them...their suggestion is if you have an appointment that is say, every Monday all year, at 900am, but sometimes it changes to 930, and sometimes say, to 830, you need to make 52 individual appointments rather that 1 52 instance recurring appointment...not a very attractive option. The other thing that can make a difference if is an appointment has any attachments..first, the attachment can change frequently, leading to possible consistency issues that way, and second, the size of the attachment can make the Exchange client on the iOS device "choke"...also, users need to accept every invitation they see..if they delete 1 invitation, or if a delegate deletes one invitation the item will drop off of the calendar.....also, you want to minimize the number of delegates..thexe things are summarized in a couple of best practices documents Microsoft has published...

http://office.microsoft.com/en-us/help/HA011276781033.aspx

http://support.microsoft.com/kb/899704/

Also, I let users know that they want to minimize the number of instances of mail clients running against exchange Server...the more clients, particularly mobile devices, the more they are looking for trouble.

OK - more testing here... In our environment it appears that Push is just not cutting it between EAS and the iOS devices. It may work for some, may not for others. If I goto the iOS device and set under Mail, Contacts, Calendars > Fetch New Data > Advanced. Locate your Exchange account and set it to Fetch, changes between iOS and Exchange are allot more reliable. Sure, this defeats the whole purpose of the immediacy of Push and how it is supposed to work, but at least all the changes I am making between the iOS device and Desktop are syncing relaibly. I even made a quick time change for an event on the desktop client and seen the change occur on my iPad within seconds, with Calendar app open on the device. I will be observing this setup to see if it does in fact seem more reliable. Our Messaging team is looking into the issues with Push services for EAS on thier side and hopefully this can get straghtened out.

Michael, thanks for this tip. We'll give this a try and keep our fingers crossed.😉.

Thanks for the great suggestions but still no joy here. I can't help but think there is some change/update on the Exchange server that's affected things. For kicks, I connected to my calendar using my old ipod which is still running 4.3. I was experienceing the same issue of certain events show up, but others were not. I spoke with our external IT contractor and he said nothings changed that he knows of. Still perplexed on this one.

Well my issued is solved for now. I'm not sure exactly what happened. But I found, deep in some discussion board, that reoccurring events have been known to foul things up. I had a couple of reoccuring event son my calendar that had no end dates. So here's what I did:

1. removed reoccuring events that had no end date
2. changed calendar to lookback only 2 weeks
3. removed Exchnage account
4. rebooted device
5. set up exchange account again
6. voila! everything worked beautifully.

I suspect that reoccuing events with no end date were somehow taxing the server and thereby timing out. I don't know for certain but it's a hunch.

Interstingly, when I went into Outlook Web Access and tried to open those few appointments that were not showing up on my devices, I got a 505 Error. So somehow they got corrupted.

Ah well, problem is solved for me. I hope this works for a few other folks.