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If you're not sure whether you should click the link in that email, don't click it, especially if the message landed in your Junk Mail folder. And remember, not all suspicious email messages get caught by Outlook's junk email filter, and some may sneak into your Inbox.
To make yourself more secure, you can disable the links in all suspicious messages.
Click Home > Junk > Junk E-mail Options.
On the Options tab, make sure the Disable links and other functionality in phishing messages option is selected, then click OK.
More about links in suspicious messages
To learn a lot more about junk mail, phishing, and suspicious messages, check out Overview of the Junk Email Filter. Also, give Change the level of protection in the Junk Email Filter a try.