Personally, I like to reboot any server once before and once after applying a Service Pack... Typically when I do that with the BES, it doesn't ask me to reboot after applying the SP, but I like to anyway.
And when I was talking about support for Exchange 2003 SP2, I was refering to upgrading the ESM on the BES server to Exchange 2003 SP2. Prior to BES 4.0 SP4, we were to remain at Exchange 2003 SP1. Outlook 2003 SP2 and Exchange 2003 SP2 (or SP1 with a couple of the hotfixes) introduced a whole bunch of different behaviour with Calendaring functionality, which is why you see soooooo many calendaring type fixes in SP4.
We've been running on SP4 since sunday, native Exchange 2003 SP 2 environment, and haven't had any issues or complaints or problems. Plus our BES Alerts are finally working again...
Oh, and we have 460+ BES users, nice sample base....
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