MTPBX and Exchange 2007 Voicemail

1. Brekeke Product Name and version:Brekeke PBX, Version 2.4.7.3 , Multi-Tenant

2. Java version: Version 6

3. OS type and the version: Windows 2008R2

4. UA (phone), gateway or other hardware/software involved: Sangoma NetBorder

5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/ ... terns.html : Pattern 9

6. Your problem: Can you use exchange as the voicemail for MTPBX?

It is possible.

Can you access the exchange from the PBX over SIP?

Has anyone ever done it?

Refer this.
http://wiki.brekeke.com/wiki/Microsoft-OCS

You can use same kind of DialPlan for the Exchange.
If you don't know how to.. ask Brekeke's support team.