Microsoft Details Offline Access In Outlook Web App 2013

Microsoft Exchange team today detailed the upcoming Offline Access support in Outlook Web App 2013. Offline access will be supported in Internet Explorer 10, Safari 5 or greater and Google Chrome browsers.

The following content will be available offline,


  • Users will be able to see all their folders, and content in all offline-supported folders.
  • Offline-supported folders include:
    • Inbox
    • Drafts
    • Any folder viewed from the browser in the last week
  • For each offline-supported folder, users will have 3 days of content or 150 items, whichever is larger.
  • Attachments are not available when offline.


  • Reminders will pop-up for meetings and appointments
  • Current month and upcoming year of calendar
  • Multiple calendars are not available when offline


  • All Contacts
  • Anyone the user emails often or has emailed recently
  • The Auto-Complete cache (the list of matching names that appear as someone is added to a message)

You can read about what user actions are supported offline in the source link below. Also, since the Offline Access makes used of IndexedDB feature of HTML5, the browsers stores the offline data not Outlook. So, the data is not encrypted and the users should use Bitlocker to protect your message from others.

Source: Microsoft Exchange Blog 

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