Outsourced exchange hogging all of my bandwith.. Can I somhow split the load to a second ISP???

I have a about 15 users sharing TI connection 1.5 Megabit.  The iconnection gets bogged down rather quickly when all users are accessing there email which is outsourced exchange service.

I was hopiing we can get a second ISP maybe a cheap Verizon PPOE DSL account to suppliment the internet connection. Since upgrading the TI is not a real option due to the High expense.  Is there any practical stable way that I split the nework traffic by application?, So I can have certain applications run through a DSl connetction and other appliications like outlook use the TI connecton  to connect to the ougsourced exchange server mailboxes..  Maybe2 network cards in a PC configured with different gateways? maybe  Dual wan router that acually works?   any other Ideas??
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gupnitConnect With a Mentor Commented:
Can you confirm the Exchange & Outlook version they are using.
Make sure that:
  • You enabled Cache Mode for the users Outlook profiles
  • Make sure that they have Offline Address Book to refer to
Please confirm, this will help reduce the load, as for 15 users 1.5Mb should be a great connection.
Take a look at this dual WAN router that supports load balancing:

XiNCOMs Twin WAN product series
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