Lion Mail - no error but mail often doesn't send or receive until quit

Hi There,
After upgrading to Lion on two machines a couple of weeks ago, both machines exhibit an issue in Mail where there is no evidence that anything is wrong (no errors or offline notices or issues in connection doctor) but Mail doesn't send or receive any mail.
One machine was an upgrade over the top of a previous install and one was a complete erase, install 10.6, then upgrade to 10.7.
When we notice that we haven't rceived any mail for a few hours, we restart mail and messages suddenly send and a whole bunch arrive.
Details:
- 10.7.3 Lion
- Exchange server
Has anyone else seen this issue?
When I call our Exchange provider, they don't really have much of a clue when it comes to Macs so I'm hopping someone here has experienced and fixed this issue?
Cheers
Ben

Inexplicably, the mac mail program now runs flawlessly on my girlfiriends new iMac. Well, I did do one thing this morning that I had not done yesterday, and I suppose that could have fixed the problem. I ran MacJanitor, both the daily and weekly parts of the program.
Though I don't really believe I did anything to fix the problem, when my girlfriend came into the room early this morning to see how the repairs were coming along, I claimed full responsibility for making it work again. She was really happy and it has been a great morning.
Thank you one and all for you help.
Patrick

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