I have been using an Asus Google Nexus 7 for about a year now. My primary Email provider is cablevision/optimum and have been able to use that account using Outlook 2007 as the email client. Until today, if I used the tablet to read emails, the emails stayed on the server until I used Outlook 2007 on my desktop (which is configured to download and remove emails from the server. Today I went to do my weekly email clean up, and I got a message "Send and Receive Complete," and no new messages appeared even though I had deleted nothing through the desktop or tablet. I checked the tablet and all emails were deleted from there as well. How do I prevent a recurrence of this. I looked through the settings on the nexus and found no option I thought could help. Please advise me with suggestions.

TIA