It is not really CUCM that would integrate with Exchange/Outlook but the complementary voicemail and presence products.

If you intergate Unity or Unity Connection with Exchange your voicemails will appear in your email inbox and may be played through PC speakers using the Viewmail for Outlook plugin. This allows you to retrive your voicemail when on the road at the same time as checking your email. You can also forward your voicemails as emails to colleagues.

If you integrate Presence Server (CUPS) with Exchange your Presnce status can be set automatically based upon your Outlook calendar.

There are probably other features available but these are the basics.

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