Apple id mess (alias as id $ @mac/@me problem)

Question

First of all I want to say that I have read almost everything about apple id, icloud, mobileme, etc. and that I know that I can not merge or delete accounts.
Second, just point out that maybe my English is not clear enough so be patient. Thanks in advance.
My situation right now is:
-Mobileme -> iCloud id. Let's say "[email protected]"
-iTunes Store. Let's say "[email protected]"
I would like to forget about my gmail account so I would like to change that apple id. Because I can not merge and I don't want to lose all my purchased items I think maybe it's possible to use a @me alias as primary email on the itunes account and then select it as apple id.
This alias was created on mobileme (I don't know if this is important). I don't want to mess things more so I want to check if this is possible before try anything. So can I use an alias as primary email and apple id for separate account??
And If this can be done, what I have to do later? I have never change my apple id so I would appreciate the steps to set up everything in my mac, ipad, itunes store, etc.
On the other hand, I detect another problem when I have tried to log in to this forum community: I found that my original username (aka.seim) was linked apparently to a @mac.com account.
It has been imposible to log in to the forum with that user name. After a lot of research I solved a problem with the primary email that was my itunes / gmail account. But after change the primary email to another I have never use on apple the problem didn't solve and the web ask me everytime I try to log in for a new username.
No problem, I have made a new one username for the forum (this one) with my icloud id, but my doubt is: due to the @mac account and my @me account uses the same data ("[email protected]" and "[email protected]") can this produce any conflict??
They have two different password but I'm not really sure because I don't remember if I transfer this @mac account to mobileme (and then to iCloud) or I just create a new mobileme account with the same data.
As I have told, I know I can delete or merge this account to solve my doubts and maybe there is no problem with having both active but I would like to make sure. Thanks.
Hope someone can understand everything :-) and help me.
Thank you so much.

Answer 1

The apps you downloaded using your old ID will forever remain tied to that ID and when you want to update them, they will ask for the Apple ID you first used to download them.
Try to see if you can remember what the password was or try to reset your password at www.iforgot/appleid.com
If your iPhone 4 is on iOS 7 and you activated it using your old Apple ID, you will still need to enter that old Apple ID to reactivate your iPhone (for example after a restore of the iOS).  Therefore, I suggest you try to recover your old Apple ID even if you continue to only use the new one.