Migrated to Exchange 2007 from '03 - Remote sites cannot connect, Corporate can

We just migrated to Ex. 07 from 03.  Users on the corportate site can connect, but users at remotes sites (site-site hardware VPN) cannot.  I have checked DNS, and it seems to be working fine.
inspireditAsked:
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inspireditConnect With a Mentor Author Commented:
Oh yeah, we have RiverBed WAN accelerators.  Problem there?
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antioedCommented:
Read the comments about Exchange 2007 connectivity/security here:

http://support.microsoft.com/kb/270836

Examine Exchange 2007 TCP requirements here:

http://technet.microsoft.com/en-us/library/bb331973.aspx

Depending on how your VPN is set up it may just be something in the network config...
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