Attachment size - Mail cannot send email attachments over 1.5Mb

Had this issue with Mac mail for well over a year now.
Mac Mail, connected to Exchange server.
Mac Mail cannot send attachments over about 1.5Mb. This does fluctuate, sometimes its as low as 600Kb.
It seems to be related to the internet speed you have, Slower internet connections and attachment size you are able to send goes down, faster speed and it allows bigger attachments to be sent.
Im assuming its some kind of time out issue.
With Windows and Outlook on the same internet connection = NO PROBLEM AT ALL!
This means its not an exchange only problem, its specific to mail and exchange.
I have several friends all switched over to Apple in the last 2 years and ALL having the same issues and despite logging several calls with Apple and trying everything they have suggested still no fix.
I have searched around and it seems lots of people are having similar issues all with no resolution to this.
Please can someone suggest anything new that might resolve this, im happy to try anything!

@Brooksymj
We had a similar problem - but we had one Mac which had been migrated from and old G5 Tiger to a new Intel iMac Snow Leopard and no problems existed (all size attachments send), so we checked out what was different about that machine's mail.plist preferences.  We spotted some obvious ones that didn't exist on a clean install of Snow Leopard, so added them, which worked for us, as follows...
1/ get Pref Setter (www.nightproductions.net/prefsetter.html)
2/ quit Mail and launch Pref Setter
3/ find com.apple.mail and double-click it
4/ click once on any one of the entries without an expansion triangle
5/ click on Actions and select Add New Array
6/ call the new array DeliveryAccounts (no space)
7/ with DeliveryAccounts highlighted, click Actions and select Add New Dictionary
8/ leave the default name of Item 1
9/ with Item 1 highlighted, click Actions and select Add New Key
10/ call the new key MaxMessageBytes (no spaces)
11/ change MaxMessageBytes class to Integer
12/ set the value to the maximum individual message size permited by your exchange server
(ours is 50MB = 52428800)
This also worked on my mbp with Lion.
Hope this works for you!
Ian

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