The remote server returned an error: (500) Internal Server Error

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I have an issue with ActiveSync on Shaw's side. I use Shaw's Zimbra ActiveSync protocol to keep my Android phone and two computer email clients in sync with contacts and calendars.

Everything was working great until maybe 6 -8 weeks ago. I thought it was something on my side but I have confirmed that it is on the Shaw side.

If I add a calendar entry or edit a contact on Shaw Webmail it doesn't reliably send the entry to all devices.

When I do the same on my devices' email client Shaw Webmail is not reliably updated. I turned on the the ActiveSync logging for my computer email client and the following error is logged:

Web exception: The remote server returned an error: (500) Internal Server Error.
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Error 500 Mailbox access error</title>
<body><h2>HTTP ERROR 500</h2>
<p>Problem accessing /service/extension/zimbrasync. Reason:
<pre>    Mailbox access error</pre></p><hr><i><small>Powered by Jetty://</small></i><hr/>


Before you ask, the password and user name are all good. Set up is all good. Nothing on my side changed.

I tried contacting Shaw Support via web chat but that was useless. The agent wanted me to call ActiveSync. They didn't understand that is is a protocol used by their Zimbra email server.  See here: 

Is there someone at Shaw that can look into their Zimbra email server settings to see what the problem is?

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