User wants to change her last name and alias (since the last name is part of the alias) on a network powered by Exchange Server 2010. If I change the alias from exchange console/user/properties tab, will all of her contacts and email still be there? I guess what I'm asking is if the account is tied to the alias, user name or something else. I don't want to change it just for it act as if she's a new user. She has years worth of information in email and contacts and needs access to it.
You can change her alias, just make sure you keep the old ones so old mail is forwarded to the new one.
Even if you were to mess up the mailbox won't be deleted so don't have any concerns about that. IF she does want to change her account name, you can simply create an email alias that points to her user account, and all messages will simply goto her 'new' email address even though they're destined for the 'old' one.
We had an issue where an intern seriously borked up our AD by running an auto-account name script. No one lost access to anything, they just didn't know what their new usernames were.