From: Aaron Anderson on
http://forums.msexchange.org/404_error_coming_from_CAS_when_accessing_2003_mailbox/m_1800523872/tm.htm


or use the short url. not sure how your readers will handle the long
wrap-around style url above:
http://bit.ly/68HLqc



our 2003 environment is 2 front ends, and 2 back ends.
our 2007 environment is 2 front ends (CAS HUB Role), and 4 back ends
(Mailbox Role)

All 2007 mailboxes work correctly. When trying to access a 2003 mailbox
(https://frontend.domain.com/exchange) I can log in, and then get to the
2003 frame, but I get a 404 in both sides. The 404 pages appears to be
from 2007 IIS 7.

Has anyone seen this?

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