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Thank you all for your input.
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I noticed that some of my SBS 2008 boxes (which have Exchange 2007) are patched with SP1 Rollup 10.<br />
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I see that SP2, and SP3 are on the market but trying to understand how to make the decision on whether I should upgrade and what the likely impacts might be.
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I noticed that some of my SBS 2008 boxes (which have Exchange 2007) are patched with SP1 Rollup 10.

I see that SP2, and SP3 are on the market but trying to understand how to make the decision on whether I should upgrade and what the likely impacts might be.

Applying SP to Exchange Server 2007

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).