Originally posted on adamfowlerit.com Today after logging on to LinkedIn, I was greeted with a new screen I found rather worrying. It is commonplace for services like LinkedIn and Facebook to scan through your address book, and ask for credentials to do so (which is rather concerning already), but a new option has popped up:     This is asking for your work username and password. No 3rd party should be asking for corporate credentials like this, even more so a company that’s been hacked before http://www.pcworld.com/article/257045/6_5m_linkedin_passwords_posted_online_after_apparent_hack.html . I tried this with a test account, entering the username and temporary password. It then asked for further information, which was the address for the Outlook webmail link and then connected and started showing contacts. LinkedIn on this page says “We’ll import your address book to suggest connections and help you manage your contacts. And we won’t store your password or email anyone without your permission.” which is a start, but it’s just such a bad practise to get into, and encouraging people to do this is irresponsible of LinkedIn in my opinion. On top of this, it’s providing an easy mechanism for staff to mass extract their contacts outside the company, which many companies frown upon or even have strict policies in place. You can’t stop people from entering in these details of course, but you can block the connection from working at the Exchange end, as long as you have at least Exchange 2010 SP1. There are a few settings to check. First, under the Set-OrganizationConfig area, you’ll need to check that EwsApplicationAccessPolicy is set to ‘EnforceBlockList’. If it’s not, it’s going to be “EnforceAllowList” and you’re probably OK, as it’s using a whitelist for access to only what’s listed rather than a blacklist, to only block...