What’s coming in the Exchange Server 15 component of Microsoft’s next wave of Office wares? Here’s some scuttlebutt from my sources.

There’ve been a number of leaks about some of the products in the coming Office 15 wave. But there’s been nothing (that I’ve found, at least) about Exchange 15, the next version of Microsoft’s on-premises e-mail, calendaring and contacts server.

Until now, at least.

I’ve been collecting any tidbits I could find from my contacts with access to the Office 15 Technical Preview bits which Microsoft began releasing to testers earlier this year. (Microsoft just this week provided some of those private testers with an Office 15 refresh, from what I hear.)

Keep in mind that Microsoft officials are not commenting on features or plans for Office 15 and won’t until the company releases the public beta of Office 15 this summer. (Possibly in June.)

With that caveat, here’s what I’m hearing.

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