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 https://owa.companyname.com/owa

After looking things up, i came to the conclusion that our externalURL should be https://owa.companyname.com/Mircorsoft-Server-ActiveSync

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
sirichaiphumiratAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Not sure why you would be using the OWA directory for this. Is it actually working? You should be using mail.domain.com/Microsoft-Server-ActiveSync.

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

Will.
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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 "mail.domain.com/Microsoft-Server-ActiveSync"  or  " https://owa.companyname.com/Mircorsoft-Server-ActiveSync"


and if mail.domain.com. why would I use that and not OWA?
thanks for the help!!
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Will SzymkowskiSenior Solution ArchitectCommented:
Sorry mail.domain.com was just an example. So yes you do need to use https://owa.domain.com/Microsoft-server-activesync.

Will.
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sirichaiphumiratAuthor Commented:
great thank you!!
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