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Iphone Activesync, Exchange and child domains!

Hello everyone,
I have introduced a subdomain for a branch office. I'm using a single exchange 2010 server, located in our HQ, its FQDN is in the parent domain.

Everything works EXCEPT iphone sync for the users in the child domain!

Iphone sync works fine for users in the parent domain.

OWA works fine on both domains, outlook too.

the error message is "unable to verify account information"
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no, I'm sorry, I've already tried this  (and it only fixed similar problems on the parent domain).

Look further up the AD tree to ensure that the OU's above the user account do not have inheritance blocked. I've seen this before.
setup /prepareAD fixed it!


Well it took me 2 days so no A for this one.