Apple is welcoming Microsoft Office into its App Store with open arms.

Well, at least that’s the vibe from Apple CEO Tim Cook’s latest tweet that was sent a few hours after Microsoft released Office for iPad:

Microsoft CEO Satya Nadella, who made his first public appearance at an event announcing the news this morning, responded with a thank you and a “#cloud4mobile” hashtag:

9to5Google writer Seth Weintraub made an interesting observation, noting Apple’s welcome letter to IBM that was published in the Wall Street Journal more than 30 years ago.

After years of speculation about its plans for Apple’s tablet, Microsoft released Office for iPad — including Word, Excel and PowerPoint — at 11 a.m. today. Check out all our coverage here:

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