Users trying access OWA in the mixed environment and getting "The mailbox you're trying to access isn't currently available. If the problem continues, contact your helpdesk."
In mixed Exchange environment (ie. OWA client
access for Exchange 2007 users goes Exchange 2010 CAS Servers -> Exchange
2007 CAS Servers -> Exchange 2007 User), Exchange 2010 server must have
previous version of OWA in it’s OWA folder.
Upgrade Exchange 2007 CAS
server to Update Rollup creates new folder of files (like UR12 for Exchange 2007
SP3 created the folder ‘8.3.342.1’) which did not exist on Exchange 2010 CAS
servers.
That causes problems for
Exchange 2007 users to login.
To fix – copy the folder to
Exchange 2010 CAS Server OWA folder (from upgraded Exchange 2007 CAS Server OWA
folder) and do iisreset on Exchange 2010 CAS server.
More here: http://exchangeserverpro.com/owa-error-mailbox-trying-access-not-currently-available/ (scroll down to the end).
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