Configuring Outlook to recognize comma separator
Outlook 2010 gives you the option of using commas as address separators for emailing purposes if you need to do so. Here's how:
1. From your Inbox in Outlook 2010, go to File, and then Options.
2. Once in Options, select Mail from the left-hand column. This will change the options shown in the right hand view of the window.
3. Scroll down the settings until you reach the heading Send messages.
4. Under the Send messages heading, click the check box next to "Commas can be used to separate multiple message recipients", and then click the OK button.
You will now be able to use semi-colon or comma as address separators.