How to Create Internet Calendar sharing in Exchange 2013 with Gmail (Non-Exchange Organizations )

Sharing Calendar to other Exchange Organizations or Office 365 . We would share using Organizational Relationships

if we need to share our Exchange 2013 Calendar to Non-Exchange Organizations like gmail or zimbra.

Or we need to have public calendars for our organizations in the internet . which his accessible via URL.

We can use sharing policies to achieve it . Let see how to achieve this .

Step 1 :

Note: This is done on Mailbox Servers

First we need to Make sure InternetWebproxy URL’s have been set in Exchange 2013 Servers

To Check The status of the URL’s

Get-ExchangeServer | fl inter*

To Set InternetWebProxy URL’s

Get-ExchangeServer | Set-ExchangeServer -InternetWebProxy https://mail.careexchange.in/owa

Step 2 :

Now Make sure OWA external URL is set . And CalendarEnabled is set to True

Get-OwaVirtualDirectory | fl Externalurl,CalendarEnabled

Now to set OwaVirtualDirectory ExternalUrls use the below shell command.

Set-OwaVirtualDirectory -Identity "CAS01" -ExternalUrl "<URL for CAS01>" -CalendarEnabled $true

Step 3 :

We need to create a sharing policy in order to allow anonymous calendar sharing

Its always recommended to create a new sharing policy . So that we can customize the policy as per our wish . when its required.

To Create New Sharing Policy 

New-SharingPolicy -Name "Internet" -Domains 'Anonymous: CalendarSharingFreeBusySimple' -Enabled $true

Note:

Sharing policies have below options where we can have different type of customizations to specific domains .

-Domains 

• CalendarSharingFreeBusySimple   Share free/busy hours only

• CalendarSharingFreeBusyDetail   Share free/busy hours, subject, and location

• CalendarSharingFreeBusyReviewer   Share free/busy hours, subject, location, and the body of the message or calendar item

• ContactsSharing   Share contacts only

'Contoso.com: CalendarSharingFreeBusySimple', 'Fabrikam.com: CalendarSharingFreeBusyDetail, ContactsSharing'

By Default AnonymousFeaturesEnabled is set to True. you can cross check it .

Get-OwaVirtualDirectory | fl anon*

Note : if you don’t want to create a new sharing policy and want to mess up with the default  policy

Run

Set-SharingPolicy -Name "Default Sharing Policy" -Domains 'Anonymous: CalendarSharingFreeBusySimple' -Enabled $true

Step 4 :

Apply the newly Created Sharing policy on the mailbox which needs this feature

Set-Mailbox CEO -SharingPolicy Internet

Now Login to OWA of CEO

Choose Calendar – Choose Share

Enter the Gmail Address or any non exchange organization email address

Now the other End .We have got the details of this calendar .

Now the calendar is visible via URL in browser

It can be added to Gmail .

Sample URL

webcal://mail.careexchange.in/owa/calendar/f50971bcbb3f48aa9a3ed2ea3b4c61c7@careexchange.in/c52ec0559e1b42f1a91cc3443faea4196601531922852437333/S-1-8-3585576920-3738051497-2994629991-3072103521/reachcalendar.ics

Note these URL’s can be used from Outlook as well .

Hope you have found this article useful .

Thank you .

Satheshwaran Manoharan

Exchange MVP , Publisher of CareExchange.in
I have been supporting/Deploying/Designing Microsoft Exchange for some years . If you any Questions ?. Please share you thoughts via Comments.