Install Steps:

UNINSTALL OLD NAMESPACES AND WEB SERVICES
 1. Open the MPS Deployment Tool.
 2. Expand "Hosted Exchange."
 3. Expand "Exchange Provisioning."
 4. Right-click "Exchange 2007 Hosted Unified Messaging" and select Uninstall.
 5. Right-click "Exchange 2007 Resource Manager" and select Uninstall.
 6. Expand "SharePoint Services Hosting."
 6. Right-click "Hosted Sharepoint" and select Uninstall.
 7. Expand "MPS Web Services."
 8. Expand "Exchange 2007 RM Web Service."
 9. Right-click each server underneath and select Uninstall.
10. Expand "Hosted Unified Messaging 2007 Web Service."
11. Right-click each server underneath and select Uninstall.
12. Expand "Hosted SharePoint Web Service."
13. Right-click each server underneath and select Uninstall.
14. Click "Start Deployment."
15. Wait for the "Deployment Completed" message.

COPY NEW PROVIDER MSI
1. Use Windows Explorer to navigate to your MSIShare directory. If you are unsure where this is, click the File menu in the MPS Deployment Tool and choose "File Locations." Note the path for "Installer Files."
2. Copy the new Exchange2007ResourceManagerNS.msi file into this location, overwriting the old file.
3. Copy the new Exchange2007ResourceManagerWS.msi file into this location, overwriting the old file.
4. Copy the new HostedSharePoint2007NS.msi file into this location, overwriting the old file.
5. Copy the new HostedSharePoint2007WS.msi file into this location, overwriting the old file.
6. Copy the new HostedUnifiedMessaging2007NS.msi file into this location, overwriting the old file.
7. Copy the new HostedUnifiedMessaging2007WS.msi file into this location, overwriting the old file.

INSTALL NEW NAMESPACES AND WEB SERVICES
1. Open the MPS Deployment Tool.
2. Right-click "Hosted Exchange" and select "Install all in this group."
3. Right-click "MPS Web Services" and select "Install all in this group."
4. Right-click "SharePoint Services Hosting" and select "Install all in this group."
5. Click "Start Deployment."
6. Wait for the "Deployment Completed" message.

INITIALIZE NAMESPACES
1. Open the MPS Deployment Tool.
2. Expand "Hosted Exchange."
3. Expand "Exchange Provisioning Configuration."
4. Right-click "Initialize Exchange 2007 Resource Manager" and select "Execute -> Initialize Exchange 2007 Resource Manager."
5. Right-click "Initialize Hosted Unified Messaging 2007" and select "Execute -> Initialize Hosted Unified Messaging 2007."
6. Expand "SharePoint Services Hosting."
7. Right-click "Initialize Hosted SharePoint" and select "Execute -> Initialize Hosted SharePoint."
8. Click "Start Deployment."
9. Wait for the "Deployment Completed" message.

SHUT DOWN PROVISIONING ENGINE
1. On the MPS Engine servers, open Component Services.
2. Expand "Component Services."
3. Expand "Computers."
4. Expand "My Computer."
5. Select "COM+ Applications."
6. Right-click "Provisioning Engine" and choose "Shut Down."

RESET IIS
1. On the Provisioning Web Service Servers, open a command prompt.
2. Type iisreset and hit enter.