Microsoft's Mac Business Unit (MacBU) team is offering its own personal congratulation message to mark Apple's thirtieth birthday month.

"Microsoft congratulates Apple on 30 years of success and innovation," a message on Microsoft's Mactopia website says, with a link to an eCard.

The eCard proclaims: "Rock on, Apple."

"Happy thirtieth Birthday! We've enjoyed our 22 years of partnership with you. Here's to many more! Cheers from the MacBU," it reads.

You can see the card here.