I have been running SP4 for about a month with no problems. It fixes a problem if you are using a mail virus scanner that uses AVAPI type scanning and you want to move mailboxes between Exchange servers. This really helps if you are migrating to a new server.
We have 2 organizations running SP4 - no problems on 1st. However, on 2nd, the proxy address generator file properties were still pointing to the SP3 dlls. Resulted in no mailbox or distribution group generation until we reset the file properties to point to the SP4 dlls (which were on the server)
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