Exchange 2010: Not read email confirmations at 01h05

Randomly, at 01h05 in the morning, our Exchange server sends out a number of "not read" message tracking emails. See screen shot. This was brought to my attention by our recruiter. She says it has happened before.

I have also had the odd out of office response from contacts referencing a subject line from a meeting request months ago. So this has happened before and for a period of time. The screenshot below is from meetings approximately 4 months ago.

I personally do not respond to Message Tracking from Outlook. All requests are ignored. I can't be sure of my phone or iPad though.

These are all related to meeeting requests as well.

Windows Server 2008 R2 running as a VM on Hyper V
Exchange 2010 Rolup 5

This has been experienced before by another EE member but was not resolved:
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xpanditAuthor Commented:
Hey, just wanted to confirm one thing...Is it Exchange 2010 SP1 RU5 or Just Exchange 2010 RU5?
I hope u have tried the following article
xpanditAuthor Commented:
I have no delegates on my mailbox.

SP1. Sorry.
My suggestion would be to install RU6 as this issue is been addressed. Although it does not look exactly similar but this should help

You receive an NRN of a meeting request 120 days after the recipient accepted the request in an Exchange Server 2010 SP1 environment

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