Yes, it is possible to have your own Outlook signature! Take a look at the following instructions, and use mine as a reference. It has a professional and casual signature and a little installer to get them in the right place.
Open Outlook and select Options from the Tools menu. When the dialog box opens, select the Mail Format tab and look at the Signatures section. You’ll be able to set your signature for new messages and for replies and forwards. While I use my professional signature for new messages, I have decided to use a more casual signature for replies and forwards. Make your choices and then click on the OK button to save it. You’re done!
1. Drop txt, html and rtf versions of your signature in C:Documents and Settings%USERNAME%Application DataMicrosoftSignatures
2. In Outlook, Tools|Options|Mail Format|Signatures. Pick your signatures.