The iPhone will not sync email or displays an error saying that it cannot connect to server.

This could be an issue with a corrupt item in your mailbox. On an ActiveSync device, you would receive the error code: 0x86000108

You can resolve this by setting the iPhone to sync all items in the Inbox and/or Calendar, depending where the corrupt item is.

To set the Inbox to sync all items:

  1. On the iPhone, go to Settings > Mail, Contacts, Calendars.
  2. Select your account.
  3. Select Mail Days to sync > No Limit.

Note: In order to prevent synchronization issues Intermedia does not recommend to use Mail Days to sync > No Limit if there are more than 3000 items in the inbox. For more information please refer to the article: Recommended Number Of Items In A Folder On Exchange.

To set the Calendar to sync all items:

  1. On the iPhone, go to Settings > Mail, Contacts, Calendars.
  2. Scroll to the bottom and select Calendar > Sync > All Events.

 

Please note that this option might be unavailable in the latest versions of iOS.

If you notice that not all of your mail folders are synchronized with the device please check if those folders are selected to push: 

  1. On the iPhone, go to Settings > Mail, Contacts, Calendars.
  2. Select your account.
  3. Select Mail Folders to Push > set place checks next to folders you wish to sync to the device.