Rules exchange 2007 upgraded to exchange 2010

We have recently upgraded from exchange 2007 to exchange 2013 CU7. We have noticed that a lot of our shared mailboxes had rules prior to being upgraded. After upgrading the shared mailboxes to exchange 2013 using Outlook 2010 our users had to remove and create new server based forwarding rules and other rules as well. Any reason why rules would not work under one version and not another.
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imkotteesSenior Messaging EngineerCommented:

Please check this one.. this applies to Exchange 2013 as well.
techdriveAuthor Commented:
Found the issue but thanks. I had to change the rules from forwarding to redirecting and they worked.

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