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recurring items


Just did the very first sync - have been using Exchange for years and needed things in Google calendar as well. After the sync, it totally mangled hundreds of old recurring items that had expired, and reinterpreted their end dates to be much later, so now my currently calendar has hundreds of items everywhere. This is despite saying I want 7 days in the last and 120 days in future!!

I happened to set logging level to debug, so have a log file which is attached.

Please help! This is a disaster!

file attachments


DavidWerdiger wrote May 10, 2017 at 7:18 AM

I checked some of the recurring items, and they are all set to end after 999 recurrences instead of their original settings. I don't have a way to restore their original settings, and certainly not with a script! I welcome any suggestions on how to do this.

phw198 wrote May 10, 2017 at 8:38 AM

Sorry to hear of the problems you've had. Here's my understanding of what's happened, correct me for any points that aren't right:
  1. You had used some other sync program at some point in the past to create events in Google to match your Exchange ones.
  2. You configured OGCS to sync into that same Google calendar
  3. OGCS "reclaimed" those existing Google events and matched them to the Exchange ones
  4. It then merged at differences from Google back in to Exchange
OGCS didn't create these recurring Google events with 999 occurrences, but unfortunately for you, as you had 2-way sync on, it has merged them back in. I can't think of any way of undoing this :-(

As to why it synced more data than expected, that's the nature of a recurring series - the first recurrence is the "owner" of all the others and if the series spans your sync range, the whole series will be synced.

Not that it helps you right now, but I will give some thought as to how to help others avoid getting into your situation. Syncing into a calendar with pre-existing items can be a bad idea - I need to make that clearer...

DavidWerdiger wrote May 10, 2017 at 2:02 PM

Thanks for the prompt response.

A few years ago I did sync with another product which I no longer use, and a similar effect happened, but only on a handful of recurring calendar items. I also tried Gmail4Outlook recently (and it works OK for contacts), and it said it synced but nothing appeared in Google calendar. The only things in my Google calendar were items placed there as a result of Google calendar invitations.

The recurring events when in Exchange all had far fewer than 999 occurrences, so how did that get mangled?

Any idea what I can do about them now?

phw198 wrote May 16, 2017 at 11:43 PM