iPhone and Office 365 - sent messages aren't delivered, aren't saved

Looking for advise and help on a issue affecting a few users in our organization. We are migrating to Office 365 and email in the cloud; a few of our migrated users have reported the following:

After weeks of the iPhone working properly with their 365 mailbox, they find that when they send messages using their 365 account on the iPhone, the message is not delivered to the recipient, is not in the Outbox or Drafts folder on the iPhone, and no Sent Item is kept. The message essentially just disappears.

The message appears to be sent and no error messages are displayed.

Shutting down and restarting the phone fixes the problem but we believe it will reoccur. This behavior did not occur with our on site Exchange 2010 servers.

Wondering if any other corporate Office 365 mail users were seeing this; additional information as follows:

- Affected users are using the native iOS Mail app for their 365 mail.
- Setup of the 365 mailbox on the affected iOS devices was done as follows:

Existing Mail Account is deleted; then -

New Mail Account is created with following settings:

      Email address: first.last@ourcompany.com
      Password: user's AD account password
      Description: Company name
      User name: user'sADname@ourcompany.com
      Server: outlook.office365.com
Who is Participating?
Jamie McKillopConnect With a Mentor IT ManagerCommented:
Here is a discussion about this issue on the Apple forums. Apparently, people are still having this issue on iOS7. https://discussions.apple.com/thread/5394686?start=120&tstart=0

There doesn't appear to be a fix.

Jamie McKillopIT ManagerCommented:

Are your phones running the latest version of iOS7? This issue you are experiencing is a known issue with iOS6.

RobertAtFoxAuthor Commented:
Very interesting JJ, I did not know that! And that's good to know, we do have users that have the older OS. However, in this case, the users are iOS 7.0.3 and 7.0.4 --
RobertAtFoxAuthor Commented:
Thanks JJ. I have calls in with Microsoft and Apple on this and they both at least acknowledge the issue; hopefully a fix is on the way. Thanks for your help!
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