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Sharing Exchange 2010 calendar with Office 365 account?

We are running Exchange 2010 for our on site email.
Recently, some users have started using Office 365 accounts.
The Office 365 accounts are still managed by IT but the 365 domain is in no way linked to the internal domain.

A user has requested if it would be possible to share their Exchange calendar with the Office 365 calendar.
One option is to just send a copy of the calendar but we were wondering if there was a way to share them the same as internal calendars. So that they both are kept synced with each other.

I started looking into this and found these two articles:
https://technet.microsoft.com/en-us/library/dd297987.aspx
http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/managing-internet-calendar-sharing-exchange-server-2010-service-pack-1-part1.html

The second one looks more relevant to this situation. Neither directly mention Office 365 but if I were to enable external URLs and sharing per the second article, would that be enough to share the calendar with the Office 365 account?

Also, are there any security concerns to keep in mind if this is done?
I have never enabled Exchange access from the internet so i'm not entirely sure what the risks are.
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SeeDk
Asked:
SeeDk
1 Solution
 
Vasil Michev (MVP)Commented:
Your best option is running Hybrid with full free/busy fidelity between the two orgs, as well as unified GAL, MailTips, etc. However, Hybrid does have some prerequisites and it might not be the best fit, so you can also look at simply creating an org relationship or using Sharing policies as detailed in the articles you linked above or here: https://technet.microsoft.com/en-us/library/jj916670(v=exchg.150).aspx
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SeeDkAuthor Commented:
Thank you, will keep this in mind if I go forward with this. It is just tentative at this point.
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