Depends on your content. If you have few databases and lots of large attachments, it could grow quite a bit.
I generally use 20% as a planning figure. That being said, most people are also increasing mailbox size as part of their move to Exchange 2010, so even if it's quite a bit more, it gets "lost in the wash". Regards, Michael B. Smith Consultant and Exchange MVP http://TheEssentialExchange.com From: Damien Solodow [mailto:damien.solo...@harrison.edu] Sent: Tuesday, March 01, 2011 10:41 AM To: MS-Exchange Admin Issues Subject: Database sizing for Exchange 2010 migration We're getting going on migrating our Exchange 2003 environment to Exchange 2010 SP1. The main thing left in the planning phase is sizing our mailbox server(s). I've found some guidelines on it, and plan to try feeding the Exchange Sizing spreadsheet from MS to see what it spits out. Also planning to poke at Exchange Profiler to see what it gives me to help feed that data. The one thing I haven't seen much on so far is database growth as part of the migration. In other words, I know how much space is used by my current mailbox stores (and how much is whitespace) but I'm not sure how large that will translate to for Exchange 2010 databases. Since the information I've seen says that SIS is gone, I'd expect it to grow but not sure how to calculate or even guesstimate the new space. Any handy calculators, magic numbers or the like? DAMIEN SOLODOW Systems Engineer 317.447.6033 (office) 317.217.6851 (fax) HARRISON COLLEGE 500 North Meridian St Suite 500 Indianapolis, IN 46204-1213 www.harrison.edu<http://www.harrison.edu/> --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com<mailto:listmana...@lyris.sunbeltsoftware.com> with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
