Nicknames are alternate email addresses (AKA aliases) you can create for users if you'd like them to be able to receive mail at another address. Heres how to add a nickname to a users account:

One of the great thing about Gmail is that it lets you send emails as if they were from your non-Gmail addresses. There's just one problem, it adds the words "on behalf of"  and displays your Gmail address in the "From" area. Of course this is one of the reasons to use Google Apps for Domains as it will let you send emails from your domain without adding any such text.

What happens if you have a second (or third) Gmail address (i.e. Google Account) that you don't often use? Well, after 90 days without use it'll be deleted. Here's what Google has to say:

You can add this Google Voice gadget to Gmail's side menu by enabling the "Add any gadget by URL" feature in the Gmail Labs settings. Then just add the gadget's URL by going to Settings > Gadget.  

Gmail has added a feature to help you identify "phishing" - fake emails that pretend to come from places such as your bank or eBay. The new feature verifies the email's source and adds a key icon to it. Currently it only highlights genuine eBay and PayPal emails but Google promise more validated emails soon. Here's how to switch it on.

According to Google many business users prefer Gmail's interface and features to products they've used in the past. However there are still those are not ready to leave the comfort of Outlook. Google Apps Sync for Microsoft Outlook enables Outlook to connect to Google Apps Premier and Education accounts syncing emails, contacts and calendar. Of course once setup the information is available in Outlook and online at Google Apps.