Office 365: Prgramtically sync Calendar with SharePoint team site calendar

Question

Hello everyone,
I need to sync office 365 Calendar with SharePoint team sites Calendars. We have SharePoint online site which having multiple sub sites, each sub site has a calendar control and we need calendar controls need to be sync with the outlook calendar available
on top bar of office 365.
We need to do it programmatically as we have more then 200 hundred sub sites, please guide me on this that how it is possible using developer app or PowerShell commands.

Answer 1

I think it might help to clarify what you mean. When you say "Office 365 Calendar", what you really mean is the Calendar associated with whomever is logged in, stored in Exchange. When you see the "Calendar" link in the little bar at the top of the page,
that's actually just a link to the Outlook Web Access calendar for a particular user's calendar stored in the Office 365 Exchange server. It's exactly the same calendar that would show up if a user had Outlook installed on their local computer and opened it
up and looked at the calendar.
That being said, you aren't going to want to synch every calendar in your whole SharePoint site with a single user's calendar. I think there are a couple approaches for you:
Create a calendar overlay in SharePoint, which displays other calendars on the current calendar view. Unfortunately, there's a limit as to how many calendars you can do this for, it's far less than 200.
Allow users to create calendar overalys in Outlook. This is the same idea as what you're doing in SharePoint, except users are doing this within Outlook. Again, adding 200 overlays isn't practical.
You can try creating an additional company calendar in Exchange that's not tied to a particular user, but then you'll have to run a timer job to keep the Outlook calendar in synch with the SharePoint calendar. This is a lot more cumbersome than just displaying
the SharePoint calendar, since you're physically copying events over to the Outlook calendar. If you do that, you personally are responsible for keeping the two calendars synched up, rather than just displaying an Exchange calendar in SharePoint, or displaying
a SharePoint calendar in Outlook.
You might looking into third party tools such as
http://www.boostsolutions.com/calendar-rollup-feature-list.html. (I haven't tried that product, it just looks like it might be the type of thing to check out.
If I have any advice, I would recommend as much as possible creating views of calendars, not actually trying to synch data, unless you're doing a one-way synch. (Synching calendar data can be a little bit difficult because you have reoccurring events to
take into account.)
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