We are moving mailboxes from Exchange 2013 SP1 to Exchange 2013 SP1.
Cross forest move, using the ECP Migration process and also used a PowerShell New-MigrationBatch .
Many mailboxes working OK.
However, some, and they all appear to be in a "remote" (other) AD site, which also has an Exchange server.
Several symptoms--
Main question here is --
When they use OWA, during the Logon process, the see the browser waiting/spinning icon. After some time, it times out.
Logs show--- 2015-02-02 18:30:26 10.152.12.60 GET /owa/languageselection.aspx