What characters are allowed in creating email accounts?

Hello.
I was posed the following question and cannot find a definitive answer.  Hopefully someone in the community can help answer.

When creating an email account - or amending a current email account - within an Exchange 2007 environment, can you use the dollar sign symbol $ as the FIRST character of that address?

Thank you.
AlegnaMBAsked:
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SupportonthespotConnect With a Mentor Commented:
Yes you can use the $ sign in an email address not a problem in fact i double checked by doing it within my test environment, however the characters you cannot use are spaces punctuation marks in brackets or the @ sign naturally.

To explain please read the following

The user name consists of words, separated by dots [`.']. A word is an "atom" or a quoted string. An "atom" is a sequence of ASCII characters (from 33 to 126; 0 to 31 and 127 are control characters, 32 is whitespace), excluding braces (`(', `)', `[', `]', `<', `>'), punctuation marks (`.', `,', `;', `:'), two other characters (`\', `"'), spaces (` ') and the mighty (`@'). A quoted string begins and ends with a quotation character (`"'). In between the quotes, you can put any ASCII character (now from 0 to 177) excluding the quote itself (`"') and the carriage return (`\r'). You can quote the quote with a backslash (`\') to include it. The backslash will quote any character. The backslash causes the following character to lose the special meaning it usually would have in the context. For example `\"' does not end the quoted string but appears as a quote in it.

But in short you want to add a $ as the first character YES you can
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vahiidConnect With a Mentor Commented:
Yes you can. We actually use those emails to identify the resources and equipment (Exchange 2007 and 2010) and the addresses are like $ConferenceRoom1@domain-name.com
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AlegnaMBAuthor Commented:
Thank you, all of you, for you quick responses! Very helpful. I will pass on and implement within the environment.  
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