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Iphone active sync is not syncing calendars

We have Exchange 2010 and Office 2010.  We've always had intermittent problems with calendars not syncing properly on our Iphones (mostly 6S and 7's).  Sometimes you would see some calendar info, but not all of it.  Usually if we turned the calendar function off and back on or if we deleted and recreated the mail account it would resolve itself.  Some of our staff have IOS 10 and some have 11 - it doesn't seem to matter which one we have.

However, nothing is working and there is absolutely nothing on the calendar.  We've deleted all of the old devices in Exchange, have deleted and recreated the mail account and still nothing.

Does anybody have any ideas??  

I did install the MS outlook app and the calendar works fine there.  However, no one wants to use that app!  We may have to insist on it, but want to see if there are ideas out there for active sync.
Microsoft OfficeExchangeiPhone

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Jackie Man

8/22/2022 - Mon

I would assume that they are using (under ios 11) Accounts & Passwords, Add Account and then Exchange is the current way you are syncing your calendars?  Because if the MS outlook app is working then the Exchange should as well.

Are the calendar items that aren't syncing ones created by other user, delegates to the main account?  We had this and I could never work it out but it seems items created by delegates do not sync?

Initially it seemed like certain items didn't display.  If I entered it, it would but if someone else did the invite it wouldn't.  However, for the past few weeks absolutely nothing shows.  The calendar is completely blank.

Yes, were were doing add account / exchange.  Email continues to sync without an issue - its just the calendar.  And I noticed that the set up in the outlook app and the IOS account pretty much mirrored each other as far as set up, but the results are very different.
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Jackie Man

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