It won't be easy for Microsoft (MSFT) to outbid Google for AOL's search business, a source close to Google's Mountain View headquarters tells us.

This source says Googlers are talking about plans to be to be "aggressive" during negotiations.

AOL's current search deal with Google (GOOG) ends soon, and earlier this year, AOL CEO Tim Armstrong said he's accepting offers from all parties for the next deal.

"Google's been a great partner. They're obviously going to get first dibs, [but] Microsoft and other people are very interesting partners as well."

"I had a Google sweatshirt on for almost a decade and I have an AOL sweatshirt on now. That's really what I need to do and our team needs to do: Make sure we get the right deal for AOL."

Tim met with Microsoft's Bing boss, Yusef Mehdi, in September.

Read: http://www.businessinsider.com/google-is-going-to-be-aggressive-on-aol-search-deal-2010-2