So far no native integration exists for Microsoft Bookings, which for Office 365 users would provide a huge benefit for coordinating customer contacts.
If you feel the same, let’s push this to the top of the requested features list! 
Hey FHS,
Biannca here from our CX team, thanks for sharing your feedback FHS.
If anyone wants to upvote this idea, please do so here https://ideas.activecampaign.com/ideas/AC-I-20215.
Please don’t hesitate to reply back out if you have any further questions.