Are "...mac.com" Apple IDs...

[davehutch]

...automatically reserved for an equivalent "...me.com" address when iCloud launches?

 

[maflynn]

Yes, though for the time being your .mac email address should still function.

When apple unveiled MobileMe, they created you a .me email address

Edit:
never mind, you're asking about apple ids and not email addresses.

 

[gyorpb]

I doubt Apple are going to bother managing "identical" @me.com and @mac.com addresses being owned by different users, so I wouldn't worry too much about it.

Additionally, Apple have stated that one can continue to use both @me.com and @mac.com addresses, so there apparently are no current plans to abandon the mac.com domain, contrary to what has been suggested here and there.

 

[jtfolden]

I doubt Apple are going to bother managing "identical" @me.com and @mac.com addresses being owned by different users, so I wouldn't worry too much about it.

Additionally, Apple have stated that one can continue to use both @me.com and @mac.com addresses, so there apparently are no current plans to abandon the mac.com domain, contrary to what has been suggested here and there.

Okay, I have a problem related to this... I originally had a .mac account so I have an Apple ID that is ABC@mac.com and I also have an ABC@me.com address.

I can login to iCloud with either email address and access the same content. If I send an email from iCloud.com then it defaults to using the @mac.com address from what I can see and it works.

On my OS X 10.7.2 system, after setting up iCloud, I can send an email using the @me address but it gives me an error using the @mac one.

On my iPad, with iCloud configured, it gives me absolutely NO option to choose between the two and defaults to @mac, resulting in an address that can't send mail.

 

[davehutch]

Yes, though for the time being your .mac email address should still function.

When apple unveiled MobileMe, they created you a .me email address

Edit:
never mind, you're asking about apple ids and not email addresses.

Not an e-mail address...an AppleID.
I've never had a MobileMe account but wanted the @mac.com to become an @me.com e-mail address