Question : Can't connect to exchange 2007 across IPSec

I have several sites on different IP ranges connected via IPCOP's VPN (IPSEC) connections.

I recently upgraded from exchange 2003 to 2007 since the upgrade my users on the remote networks can't connect to exchange unless they PPTP the main network.

I can ping across the vpn networks, and users authenticate back to the AD Box it is just exchange that won't connect.

Any suggestions

Answer : Can't connect to exchange 2007 across IPSec

how are the clients configured mapi?
Are the clients in the same AD site or diferent?
Is all the mail central in one location?

have you check for latency between sites.......

can the user get to the server via OWA?
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