Random Problem: Mail Process 140% in Activity Monitor/1 IMAP Account

Hello,
A friend of mine is having some problems with his Mail Account. As stated in the title, the Mail process uses 140% of the CPU as shown in Activity Monitor, but it's a random error, it doesn't happen all the time. I believe he restarts the application to make it go away, as it slows down his computer, and the fan starts making a lot of noise.
He has:
OS X Mountain Lion 10.8.4
Mail 6.5 (1508)/No plugin
1 IMAP account
A few thousand emails between the inbox, sent and a few folders
There isn't any problem with the mail server.
I've checked his account parameters, they seem fine.
He can send/receive emails (He told me so, and I've checked by sending a mail from his account to his account).
Here are some lines from the log files:
    +                         ! 2 -[IMAPMailboxSyncEngine _processResponsesWithMonitor:]  (in IMAP) + 538  [0x7fff8d7a2b95]
    +                         ! : 1 -[IMAPResponse responseType]  (in IMAP) + 15  [0x7fff8d7ac1af]
    +                         ! : 1 objc_msgSend  (in libobjc.A.dylib) + 25  [0x7fff88ae9259]
    +                         ! 2 -[IMAPMailboxSyncEngine _processResponsesWithMonitor:]  (in IMAP) + 393,1057  [0x7fff8d7a2b04,0x7fff8d7a2d9c]
    +                         ! 1 -[IMAPMailboxSyncEngine _processResponsesWithMonitor:]  (in IMAP) + 111  [0x7fff8d7a29ea]
    +                         ! : 1 +[IMAPFramework userAgent]  (in IMAP) + 72  [0x7fff8d79699b]
    +                         ! :   1 objc_sync_exit  (in libobjc.A.dylib) + 23  [0x7fff88aed4e8]
    +                         ! :     1 id2data(objc_object*, usage)  (in libobjc.A.dylib) + 709  [0x7fff88afddc4]
    +                         ! 1 -[IMAPMailboxSyncEngine _processResponsesWithMonitor:]  (in IMAP) + 606  [0x7fff8d7a2bd9]
    +                         !   1 objc_msgSend  (in libobjc.A.dylib) + 25  [0x7fff88ae9259]
    +                         1 -[IMAPMailboxSyncEngine _goWithMessages:]  (in IMAP) + 808  [0x7fff8d7a2520]
    +                         ! 1 -[IMAPMailboxSyncEngine _shouldContinueSyncingWithMonitor:]  (in IMAP) + 73  [0x7fff8d7a2957]
    +                         !   1 -[ActivityMonitor error]  (in CoreMessage) + 1  [0x7fff89ce29fa]
    +                         1 -[IMAPMailboxSyncEngine _goWithMessages:]  (in IMAP) + 1057  [0x7fff8d7a2619]
    +                           1 -[IMAPMailboxSyncEngine isReset]  (in IMAP) + 1  [0x7fff8d79cd57]
  + !           : 548 -[IMAPClientOperation main]  (in IMAP) + 84  [0x7fff8d77cae3]
    + !           : | 547 -[IMAPGateway allowClientOperationThrough:]  (in IMAP) + 369  [0x7fff8d797fd4]
    + !           : | + 546 -[IMAPGateway _allowClientOperationThrough:]  (in IMAP) + 1237  [0x7fff8d798501]
    + !           : | + ! 546 -[IMAPConnection prepareAndExecuteOperation:outWrongState:]  (in IMAP) + 1247  [0x7fff8d7859f5]
    + !           : | + !   546 -[IMAPClientFetchOperation executeOnConnection:]  (in IMAP) + 26  [0x7fff8d778ee2]
    + !           : | + !     546 -[IMAPConnection executeFetch:]  (in IMAP) + 44  [0x7fff8d78b3d1]
    + !           : | + !       538 -[IMAPConnection _responseFromSendingOperation:]  (in IMAP) + 863  [0x7fff8d78ba87]
    + !           : | + !       : 480 -[IMAPConnection _copyNextTaggedOrContinuationResponseForCommand:exists:]  (in IMAP) + 551  [0x7fff8d7867eb]
    + !           : | + !       : | 472 -[IMAPConnection _copyNextServerResponse:]  (in IMAP) + 55  [0x7fff8d78657a]
    + !           : | + !       : | + 281 -[IMAPResponse initWithConnection:error:]  (in IMAP) + 608  [0x7fff8d7af5f8]
    + !           : | + !       : | + ! 270 response_without_tag  (in IMAP) + 237  [0x7fff8d7b166b]
    + !           : | + !       : | + ! : 67 fetch_response  (in IMAP) + 2746  [0x7fff8d7b2b81]
    + !           : | + !      : | + ! : | 44 createFlagsSet  (in IMAP) + 159  [0x7fff8d7b4897]
+ !           : | + !       : | + 137 -[IMAPResponse initWithConnection:error:]  (in IMAP) + 144  [0x7fff8d7af428]
    + !           : | + !       : | + ! 129 -[IMAPConnection(MFPrivate) _readDataOfLength:intoData:error:]  (in IMAP) + 112  [0x7fff8d78ce14]
    + !           : | + !       : | + ! : 126 -[IMAPConnection _readLineIntoData:error:]  (in IMAP) + 53  [0x7fff8d786486]
    + !           : | + !       : | + ! : | 90 -[Connection _readLineIntoData:error:]  (in CoreMessage) + 202  [0x7fff89cf14f3]
    + !           : | + !       : | + ! : | + 90 -[Connection _fillBuffer:]  (in CoreMessage) + 764  [0x7fff89cf1961]
    + !           : | + !       : | + ! : | +   90 -[Connection _readBytesFromSocketIntoBuffer:amount:requireAllBytes:error:]  (in CoreMessage) + 76  [0x7fff89cf1a7b]
    + !           : | + !       : | + ! : | +     89 -[_NSSocket readBytes:length:error:]  (in CoreMessage) + 161  [0x7fff89cd78cb]
    + !           : | + !       : | + ! : | +     ! 50 _handleRequestWithTimeout  (in CoreMessage) + 1717  [0x7fff89cd51a7]
    + !           : | + !       : | + ! : | +     ! : 44 -[NSRunLoop(NSRunLoop) _removePort:forMode:]  (in Foundation) + 460  [0x7fff8eb4513d]
    + !           : | + !       : | + ! : | +     ! : | 40 ???  (in Mail)  load address 0x1024e3000 + 0x45ff  [0x1024e75ff]
Also, the Activity (in Mail I think) window shows that these lines:
Inbox/updating cache directory ; Fetching new mail ; Synchronizing with server/Getting unread counts ; Communicating with server/Inbox fetching
all end up with a red "stop sign" at the end.
He seems to have the latest version of Mail, so we can't update it, and he doesn't want to properly uninstall/reinstall the Mail program.
Please, if you have any idea on what we could do.
Thank you for your help.

Step 1
Take this step only if you have more than one incoming mail account, and only some of them are affected by the problem.
From the Mail menu bar, select
Mail ▹ Preferences ▹ Accounts
From the account list on the left, choose one of the accounts that is not giving trouble. Select the Account Informationtab if not already selected, and then uncheck the box marked
Enable this account
Repeat with each of the other well-behaved accounts. Don't disable the problem accounts.
Step 2
From the Mail menu bar, select
Window ▹ Connection Doctor
Click the Show Detail button. A drawer opens. Click Check Again and post the text that appears. Anonymize any personal information before posting.
Step 3
If you took Step 1, re-enable the disabled accounts.

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    Review with Connection Doctor.  An interesting observation of the Detail screen of Connection Doctor is that I did not see any activity for my Exchange domain.  Activity was listed for all other email accounts except the Exchange account.  Hmmm......
    Finally had to remove the Exchange account and re-create it.  Only then did the recent and other email appear.
    Arrrrgggghhhh......

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