outlook calendar share with an outside user

Is there a way to share a your calendar or give access to a user that is out side your domain or company.

For example, i would like to share my work calendar which is exchange 2010 using outlook 2010 to another user from a different company. That user is using office 365.

thanks
sirichaiphumiratAsked:
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diperspCommented:
Last I researched this, Microsoft did away with the (native) ability to do this.  We did a work around in the past where we setup a dummy GMail account.  The GMail account wasn't used in any way EXCEPT to sync the calendar from Outlook to GMail.  Then we shared the GMail calendar with the other user.  Works, but not the best in my opinion.  Haven't looked in to in a while to see if there's a better method.
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Alexa JacksonDigital Forensic AnalystCommented:
Hi,

As per the information and details provided by you, to share the Outlook calendar by outside user, please follow these steps: -

You will use the Set-CalendarProcessing cmdlet to set ProcessExternalMeetingMessages to True so the room processes the meeting request and will need to enable Internet Calendar publishing on the server.

Set-CalendarProcessing -Identity "conference1" -ProcessExternalMeetingMessages $true

To enable Internet Calendar Publishing, use the following cmdlet to enable calendar sharing on OWA, create a sharing policy then apply it to specific mailboxes or organization units.

Set-OwaVirtualDirectory -Identity "servername" -ExternalUrl "<URL>" -CalendarPublishingEnabled $true

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

Set-Mailbox -Identity conference1 -SharingPolicy "InternetCalendar"

You may also want to control how much information is shared and date ranges to include. The defaults are to share availability only and publish 3 months.

Set-MailboxCalendarFolder -Identity conference1:\Calendar -DetailLevel LimitedDetails  -PublishDateRangeTo SixMonths

Thanks and regards
Alexa@J
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diperspCommented:
Alexa -

How does the external user add this calendar to their Outlook?
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