Our corporate AD is named corp.company.com. To make things a bit
simpler for the users, I've thought about adding the UPN Suffix
"company.com" and assigning that for the users. Are there any issues
with this? The dialog box seems to indicate this is what it's intended
for, but I'm all too familiar with the 'just because you can, doesn't
mean you should' adage.

I assume if it's safe to do, that new users will be fine, but what about
existing users? Any issues (beyond informing them to use it) going from
(E-Mail Removed) to (E-Mail Removed)?

The follow articles might offer you some info:

Users Can Log On Using User Name or User Principal Name
http://support.microsoft.com/?id=243280

HOW TO: Add UPN Suffixes to a Forest
http://support.microsoft.com/?id=243629


"David Adner" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Our corporate AD is named corp.company.com. To make things a bit
> simpler for the users, I've thought about adding the UPN Suffix
> "company.com" and assigning that for the users. Are there any issues
> with this? The dialog box seems to indicate this is what it's intended
> for, but I'm all too familiar with the 'just because you can, doesn't
> mean you should' adage.
>
> I assume if it's safe to do, that new users will be fine, but what about
> existing users? Any issues (beyond informing them to use it) going from
> (E-Mail Removed) to (E-Mail Removed)?