If you have an Office 365 or other Microsoft Exchange-based email account, and you want to share your calendar with someone who is inside or outside your organization, you can give them permissions to view your calendar.Calendars shared by email arrive in the recipient’s Inbox as email message attachments, with a Calendar Snapshot in the message body. For example, you can change fonts or highlight days or appointments.

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Or is the download in the OST of Shared Calendars done on access basis only?

1- If the user didn’t have cached mode enabled for Shared Folders, but already had 10 calendars configured on their profile, and then if later on we enable cached mode for Shared Folders, these 10 calendars will be “downloaded” onto the OST file when users access these only – not all at once.

You can share calendar information with other people by using Outlook in several ways.

You can choose the method that is best for you, depending on the type of servers that you and your recipients have access to.

Optionally, you can grant them permission to modify the events and appointments in the calendar.

If you have an Office 365 or other Exchange-based account, you can also send a sharing invitation to other users so they can view your calendar in their own Calendar list.

The shorter the refresh rate, the more up-to-date your calendar will be.

The longer the refresh rate, the less up-to-date your calendar will be.

If you’re using Office 365, watch these videos to learn about sharing your calendar from Outlook or Outlook Web App: The person you sent your calendar to will see a snapshot of your calendar in the message.

The message also includes an attached i Calendar (.ics) file that they can open in Outlook or another calendar program.

Updates download of calendars is on access only when “Download Shared folders” is checked on Outlook (2010, 2013) As a summary, if the user has cached mode enabled, calendars will be updated when they will access the calendar, if users doesn’t have cached mode enabled, calendar connection will be on access only as well.