I never had any issues with OWA redirection for a few users that I migrated from Exchange 2010-2013 initially. For users that I am migrating in the past few days, the OWA 2013 is landing on Exchange 2010 despite the mailbox being successfully migrated to
Exchange 2013.
Troubleshooting:
1. I have restarted the IIS Services
2. I have restarted MSExchangeOWAAppPool.
3. I have also checked the homeMDB attribute of the 2013 migrated user with the Exchange 2013 database.
I would really appreciate if anyone could share their experiences on similar issues.