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Mapiexpection network error while move mailbox to Exchange 2010

I thought of listing this on the website since there might be someone else struggling with this issue.

A reader came to me with this issue. While attempting to move mailboxes from his Exchange 2003 server to Exchange 2010, we get an error:

“error mapiexpection network error”

I looked and wondered what’s up with this “Network error”???

This behaviour was caused by ISA server 2004. ISA has a cool feature called “RPC filter” to secure connections between server/remote server/ remote client.

I disabled this on the ISA 2004 box and tried the move and it worked fine.

If you need to know more about RPC Filter, refer:

Using the Exchange RPC Filter to Publish Microsoft Exchange

Ratish Nair
MVP Exchange
Team@ MSExchangeGuru

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