[There's a reason that Yoda is the unofficial mascot of SBS. Size indeed matters not.] Outlook 2007: PST and OST files may be up to 20% larger after the February 24, 2009 Cumulative Update: - THE OFFICIAL BLOG OF THE SBS "DIVA"
Sun, Mar 22 2009 18:00 bradley

Outlook 2007: PST and OST files may be up to 20% larger after the February 24, 2009 Cumulative Update:

Outlook 2007: PST and OST files may be up to 20% larger after the February 24, 2009 Cumulative Update:
http://support.microsoft.com/?kbid=968413
The February 24, 2009 cumulative update for Outlook 2007 includes changes related to the general reading and writing characteristics of the .pst/.ost file so that less is demanded from your hard drive to perform the same general operations in Outlook. For instance, the file flushing process was optimized so that it interacts more efficiently with operating system and disk-write caches. There is also a change in the way new data is written to the .pst/.ost so that the data is saved much closer together on the physical disk. As a result, there is less physical work required from the drive, thereby speeding up the time it takes to write the same amount of data to the drive. However, a side-effect of this data writing algorithm is that .pst/.ost files will be about 20% larger than before the February 24, 2009 cumulative update.

I think I'll put up with the larger size for the benefit that it gives in performance and speed.

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# re: Outlook 2007: PST and OST files may be up to 20% larger after the February 24, 2009 Cumulative Update:

Sunday, March 22, 2009 10:07 PM by OBTS

Most will think this a ho-hum; but if you are near the limit of the PST/OST file size and, if the change pushes you over, then your Outlook might fail to come up.  Does the update rewrite all the data in the current file?  If no, then you probably will not feel the pain right away.  Just sooner than you would expect.

# re: Outlook 2007: PST and OST files may be up to 20% larger after the February 24, 2009 Cumulative Update:

Sunday, March 22, 2009 10:10 PM by bradley

If you are near the top of the 20 gig ost file limit, chances are you would have ripped out Outlook 2007 and rolled back to Outlook 2003 a long time ago.