We currently have an Exchange 2010 setup that is configured with SSL certs on 123.com, this is used by OWA and mobile phones (Blackberry's, Iphones, Androids)
We have re branded so now our primary domain is ABC.com however all of the SSL certs and access is still configured for 123.com which are due to expire.
I have to change this and have purchased a new wildcard SSL cert for abc.com, my concern is that when i replace the SSL cert what will the impact be on mobile devices, we have about 300 so re-configuring those is going to take some time.
For a period of a month we are going to forward webmail.123.com to webmail.abc.com which will be fine for people using OWA but i'm not sure that will help with mobiles, most use activesync configured to connect to webmail.123.com
Has anyone been through this before and have advice
Thanks for the feedback, the previous SSL cert is also a wildcard so a new one has just been purchased, ill see if we can change it.
I have put the new DNS records in place to point to our public IP for abc.com.
Interestingly enough (and i don't know how) but I tested an Iphone and a windows phone to connect to webmail.abc.com even though our exchange is still configured with the SSL ccert and external URL's of webmail.123.com and it worked fine, i was expecting it to fail with a mismatch of the SSL.
Then to confuse matters i tested it with 2 other Iphones (all Iphone 5's) and they had the SSL message as it didn't match
Any ideas why it would work on some and not others.