exchange active sync help

I'm currently task with cleaning up thing on exchange an noticed that our activesync External URL is different from the internalurl.

our current internalurl is https://servername.cb.local/Mircorsoft-Server-ActiveSync and
externalurl is

After looking things up, i came to the conclusion that our externalURL should be

My question is what is the difference between those 2 externalURL?
And if i change the current externalURL to the new one, can i do that on the FLY? Will it knock people off of activesync when change it?

thanks to anyone that can shed some light on this matter
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Will SzymkowskiSenior Solution ArchitectCommented:
Not sure why you would be using the OWA directory for this. Is it actually working? You should be using

Changing this over should not have any impact on how you are connecting. This is how it should be set in the first place.

sirichaiphumiratAuthor Commented:
Yes its been working, we do see some cert errors, but it works.

After the research i found out that i needed to correct it.  So are you saying i should be using ""  or  ""

and if why would I use that and not OWA?
thanks for the help!!
Will SzymkowskiSenior Solution ArchitectCommented:
Sorry was just an example. So yes you do need to use


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
sirichaiphumiratAuthor Commented:
great thank you!!
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.