Mountain Lion / Mac mail disconnects from MS Exchange server.

We use an MS Exchange account for our company email. We bought 2 new retina display MacBook Pros running Mountain Lion last Fall. My old laptop is still running Lion. Lion / Mac Mail works fine on the old laptop, never losing contact with the MS Exchange server. Mountain Lion / Mac Mail randomly loses contact with our exchange server on a regular basis. This results in a slow and painful re-download of 2 years worth of email while I have to resort to my old laptop to keep up with new incoming email. I check these discussions occasionally when I can find a spare moment and I have found some similar symptoms being complained about, but no solutions yet. There have been a couple of OS updates since we bought the new laptops, but alas, no mention of this problem. It seems no one is doing anything about it. Have I missed a post? Anyone have any suggestions? This is getting really old.
Thanks!
D

I was having the same issue! I finally found a solution to it!
1. Delete your exchange account from the Mail, Contacts & Calendars pane in System Preferences.
2. Go to Finder, click "Go" in the menu bar, click "Go to Folder" and type in "~/Library" (without the quotes) in the box. This will take you to your user Library folder.
3. Use the search box in the finder and type in "com.apple.notes" and click "Library" in the search bar that appears. This should now find several folders and files related to the Notes app. Rename or delete everything except the help files (with the lifesaver icons on them). Just to be safe, I'll list the files and folders you should delete or rename and their directory paths:
com.apple.Notes - /Users/danieloria/Library/Containers/com.apple.Notes/
com.apple.Notes - /Users/danieloria/Library/Containers
com.apple.Notes.plist - /Users/danieloria/Library/Containers/com.apple.Notes/Data/Library/Preferences
com.apple.Notes.savedState - /Users/danieloria/Library/Containers/com.apple.Notes/Data/Library/Saved
4. Restart your Mac. Put your exchange account back into System Preferences, you can go ahead and activate the Notes sync service.
5. Open Notes and it should be working now!
NOTE: I also deleted all the stored information related to the exchange account in Keychain Access when I deleted the 4 com.apple files. This may or may not be necessary, but I just thought it was worth mentioning.

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