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I would like to upgrade our 2007 Exchange server from the initial release (RTM) to SP1, or if it makes sense to a later SP. I would appreciate an order of magnitude kind of estimate, is it an hour, 6 hours, a weekend?

It's running on a Dell Server PE 2950, with a Xeon 5130 CPU (2 GHz) with 4 GB of RAM. Windows 2003 SP2 x64. We have about a TB of disk running with Dell RAID. Unfortunately, the C drive only has about 5 GB free; it was set up by a consultant years ago as only a 20 GB drive. The data stores for Exchange are around 600 GB on a separate D drive.

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up vote 5 down vote accepted

Applying a Service Pack to an Exchange Server should not take more than 2 hours time on reasonable hardware. Make sure you have a current backup before you start! I'd also recommend to apply the latest Service Pack (SP3, I think), as well as the latest Update Rollup.

See the Release Notes for Exchange Server 2007 SP3 for more information on compatibility and so on.

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I did this last November, it took me about an hour I think on some decent hardware. I believe there is a later service pack and also an update rollup available. –  SpacemanSpiff Jul 23 '12 at 13:23
    
Can I go straight to SP3 without having to go through the intermediate SP1, 2, etc? –  Knox Jul 23 '12 at 13:24
    
I think you have to go to SP1 first, then you can skip SP2 and go right to SP3, then apply the update rollup. It's documented somewhere you'll find it. –  SpacemanSpiff Jul 23 '12 at 13:26
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You can go to SP3 directly, and then apply the rollup: You can use the following methods to install Exchange 2007 SP3: On a computer that is running the original release version of Exchange 2007, upgrade the program to Exchange 2007 SP3. On a computer that is running Exchange 2007 SP1, upgrade the program to Exchange 2007 SP3. On a computer that is running Exchange 2007 SP2, upgrade the program to Exchange 2007 SP3. Perform a new installation of Exchange 2007 SP3. Release Notes for Exchange Server 2007 SP3 –  MichelZ Jul 23 '12 at 13:28
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