Forum Discussion
update waiting time after sharing calendar with external user
When I share a calendar with an internal Office 365 user updates to that calendar updates on the calendar appear almost instantly. But when I share a calendar with an external Office 365 user, there...
Julia Foran
Microsoft
MicrosoftHi there, yes, that is the expected behavior right now: sharing internally will sync changes instantly but cross-tenant is still periodic syncing (approximately every 3 hours). I've detailed this behavior in the support article at aka.ms/sharedcalendars, if you scroll down to the section titled "Instant syncing". We're working on releasing instant sync'ing cross tenant but don't yet have a timeline.
Have an open support case with Microsoft on this syncing issue with external users. We have been using this setup for one of our clients and in reality the syncing process has always happened automatically and in a reasonable time frame. Until approx a month ago
Now ics subscribed calendars are syncing intermittently sometimes instantly sometimes outside the three hour windows and sometimes not at all.
This on test events created at the same time with different results.
Now looking at calendar sharing options outside of Microsoft as the service is far too inconsistent for our corporate clients to rely on anymore.
- Julia Foran
Hi Thyran,
When you create an ICS calendar & share it to someone else (let's say User A), the sync frequency is controlled by User A's calendar service. Unfortunately there's no way to initiate or force a sync from the calendar owner's side.
So if User A uses the URL to add it to an Exchange On-Prem account, the sync frequency is controlled by a setting in the on-prem installation. If User A adds it to an Office365 account, the sync frequency is approximately every 3 hours. If User A adds it to another calendar service, such as Google Calendar, the sync frequency is whatever Google chooses.
If both users are in different Office 365 organizations, and they share the calendar (rather than publishing via ICS), this is considered "true sharing". Right now, the sync delay is also approximately every 3 hours, but we're working on making it instantly sync for "true sharing", just like we do when both users are in the same organizations.
Feel free to message me if you have more concerns or questions. We care deeply about improving the calendar sharing experience. We've been focused on first addressing all the issues when sharing within the same organization, and then we'll begin working on improving the cross-organization scenarios.
Hi Julia
Thanks for the feedback.
The issue is after testing it for the past three weeks there seems to be an inconsistency with the syncing process for external users cross tenant and third party ics subscriptions
I have been testing this with several of my clients tenants with my work tenant and personal google account.
Events update almost immediately 50% of the time if it is cross tenant. The other 50% of the time half the events are updated almost immediately while the other half don't update at all. This happens even when you delete the events. One event is removed while the other is left behind.
ICS subscriptions with google only show the existing data any new data is not syncing at all regardless of how long you choose to wait. Only removing the ICS subscription and re-adding it shows the new data.
There seems to be a major issue with calendar sharing with external users at the office 365 level at least is problematic at the moment
Have engineers at Microsoft looking into it hopefully get some results soon
Thyran_Wright I have the same problem.
1. Share the calendar (Main-Calendar "Calendar") with an external person with a normal free outlook-account.
2a) Share via "Sharing" from Web-Version (Office365)
2b) Share via Web (ICS-Link) from Web-Version (Office365)
3. All events will be synchronized the first time.
4. After that, no synchronization for new events. I wait more than 5 hours.
Best regards
Kay
