I am trying to set up exchange 2013 along with exchange 2007.
I believe we can create legacy URL for OWA as long as mailbox is on exchange 2007
Set-OwaVirtualDirectory –Identity “ex2013servername\owa (Default Web Site)” –InternalUrl https://webmail.domain.com/owa –ExternalURL https://webmail.domain.com/owa
Set-OwaVirtualDirectory –Identity “ex2007servername\owa (Default Web Site)” –InternalUrl https://legacy.domain.com/owa –ExternalURL https://legacy.domain.com/owa
but we have users around 2000 of them using activesync on their phone using presently exchange 2007 how that will work for the time being till users are not migrated to exchange 2013 box and if we have exchange 2013 in place as it does not do redirection as regards to exchange 2007.