How to Upgrade to Exchange 2013 without Migrating Public Folders
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1. Check for existing Public Folders in the IPM subtree and their size (if there are any)

2. Remove OAB

3. Delete system and non-system PF

Get-PublicFolder -Server Ex-2k7 "\" -Recurse -ResultSize:Unlimited | Remove-PublicFolder -Server Ex-2k7 -Recurse -ErrorAction:SilentlyContinue

Get-PublicFolder -Server Ex-2k7 "\Non_Ipm_Subtree" -Recurse -ResultSize:Unlimited | Remove-PublicFolder -Server Ex-2k7 -Recurse -ErrorAction:SilentlyContinue

4. Set status of PF Migration to true.

Get-OrganizationConfig | Set-OrganizationConfig -PublicFolderMigrationComplete:$true

#NOTE: You need to ignore the warning (Exchange 2013 changes this display name during setup):

"WARNING: Display Name of the Exchange Recipient object should be Microsoft Exchange. Run Set-OrganizationConfig with no parameters to correct the Display Name value."


5. Check Exchange 2013 default OAB for MBX DB and URL


6. Remove the server as a source server in the Internet Send Connector properties


7. Uninstall from control panel


8. If necessary, create Exchange 2013 Public Folder Mailbox, grant permissions and copy back the PF that were stored in the admin mailbox in the beginning.