Unable to set signature for different accounts

Question

I have a client site where all users have an email address at two different accounts, the same two for all users. All users have a signature setup in Outlook for each email account.
For all users except one, when they select the Inbox for account A and select New Email, they get the signature for account A; and when they select the Inbox for account B and select New Email, they get the signature for account B.
But there is one user who gets the signature for account A no matter whether she creates a new email after selecting the Inbox for account A or account B.
I've looked at her signature setup in Options in Outlook and it's set correctly. She has two signatures and each is assigned to the appropriate account and New messages and Replies/forwards are both set to the appropriate account.
I myself have Outlook setup with multiple accounts and each account has its own signature and when I select any particular Inbox and create a new email, the appropriate signature is added.
Any ideas as to why it keeps defaulting to the signature of one account no matter which Inbox she chooses to create a new email from?
Jonathan

Answer 1

Thanks for your reply. She is using Office 2007. I read what is at the link you provided and unfortunately it wasn't any help.
It says for Outlook 2007 to ensure a signature is set for the default email account. She had a signature set for her original account which is an Exchange one and is the default.
She recently added a second account, which is an IMAP one, and created a signature for it but when she creates an email to be sent out from her new account, the signature in the new email is that of the default account, not the new one, even though Outlook
options is set up correctly so new emails and replies/forwards from the new account are supposed to use its signature.
I tried Outlook in Safe Mode and it was no different.
One other thing is that when she opens the New Mail window there is an Account button right below the Send button. If she changes to the second account, the signature changes and this is how she is sending out email from the second account.
But everyone else in the office does not have to do this. With everyone else, if they first select the Inbox of the second account, then open a New Mail window, the signature is that of the second account. This is how it works on my computer where I have
multiple accounts.
So for some reason it's like Outlook is not detecting that she has selected the Inbox of the second account before opening New Mail. Or else it does detect it and is still defaulting to the primary account. This is what I'm trying to fix.
Jonathan