Exchange ActiveSync doesn't download attachments to Calendar items on mobile devices

Original KB number:   2503175

Symptoms

Attachments on meetings or appointments are not available when you synchronize the Calendar with a Microsoft Exchange ActiveSync client.

Cause

This problem occurs if one or both of the following conditions are true:

  • The Exchange ActiveSync client doesn't support version 16 or a later version of the Exchange ActiveSync protocol.
  • The mailbox is located on a version of Exchange that doesn't support version 16 or a later version of the Exchange ActiveSync protocol.

Resolution

To synchronize attachments in a calendar item, follow these steps:

  1. Move the mailbox to Exchange Online or to Exchange 2016.
  2. Upgrade the device to a client that supports version 16 or later.

More information

For more information about the Exchange ActiveSync protocols, see: