FOR IMMEDIATE RELEASE

NEW StuffIt Deluxe BRINGS BREAKTHROUGH JPEG IMAGE COMPRESSION TO THE MAC

New Version Includes Spotlight and Automator features, improved .Mac
support, compression optimizations, and a powerful new file distribution
system for Mac OS X

Aliso Viejo, CA - September 13, 2005 - Allume Systems, Inc., a division of
Smith Micro Software, Inc. (NASDAQ: SMSI), today released StuffIt Deluxe
10, the latest version of its innovative data compression, access, and
management tool for Mac OS X. This release includes our patent pending JPEG
compression technology, allowing users to compress JPEG images and photos
up to 30% with no loss in image quality. The only previous solution
available for those looking to reduce the size of JPEG images was to
further reduce the quality of the image. StuffIt's JPEG compression
technology provides a new solution that offers smaller files without any
penalty of reduced picture clarity. The product also allows users to view
thumbnails for archived JPEG images without requiring them to decompress
the archive.

"StuffIt's ability to compress JPEG images and photos - without reducing
image quality - represents a significant innovation in the field of data
compression," said Matthew Covington, Director of StuffIt Product Line.
"Along with its strong encryption, superior compression, and self-healing
features, JPEG compression provides another clear reason to use the StuffIt
X file format."

StuffIt Deluxe also offers new features that seamlessly integrate with Mac
OS X 10.4 "Tiger". The included Spotlight Importer allows Spotlight to
index file names for items stored inside StuffIt, Zip, and Tar archives.
When the user performs a search, Spotlight will now list all the archives
on the user's computer that contain files that match the search terms.
StuffIt Deluxe 10 also includes support for Tiger's new Automator scripting
tool allowing users to compress and expand StuffIt, Zip, and Tar archives
as part of their Automator workflows.

StuffIt Deluxe 10 includes StuffIt SEA Maker, a new tool that provides the
user with unprecedented control over how files are packaged for
distribution. Users can create powerful self-extracting "packages" that
allow them to control where files are expanded on their recipient's
computer. Users can even add a splash screen and text dialog to their
distribution.

Overview of new features and benefits:

New! JPEG Compression: Compress JPEG photos and images up to 30% without
further reducing image quality.

New! Preview Thumbnails: Preview archived JPEG images within StuffIt X
archives (.sitx) without having to decompress the data.

New! Spotlight Importer: StuffIt Deluxe 10 extends the reach of Apple's
Spotlight search technology to include files stored in StuffIt, Zip, and
Tar archives.

New! Automator Support: Use Mac OS X 10.4's Automator to create automated
solutions that include the ability to compress and expand StuffIt, Zip, and
Tar archives.

New! Package Files for Distribution: StuffIt SEA Maker allows users to
create self-extracting archives that open automatically on Mac OS 10.3 and
10.4. Users can specify the directory to which files in the archive will be
expanded, and can also choose to generate and display a splash screen and
text dialog during installation.

New! and Improved "Restore" mode: StuffIt Expander features a new restore
mode that will allow users to automatically expand the contents of an
archive, created with Archive Assistant, back to the location on the hard
drive from which they were backed up.

Improved Performance: The introduction of a new "Better" compression
algorithm allows StuffIt to compress up to 20% faster than prior versions.

Improved .Mac Support: StuffIt Express PE now allows users to create
dropboxes that can send and retrieve files from a .Mac iDisk.

Improved Encryption: Users now have to enter a password to view the
contents of an encrypted StuffIt X archive (.sitx), but unlike previous
"whole archive encryption" implementations, once a password has been
entered, the contents of encrypted StuffIt X archives can be changed.

Pricing, Availability and Requirements

The MSRP for StuffIt Deluxe 10 is $79.99, available directly from Allume
and popular retailers and catalogs and distribution partners worldwide.

Registered users of StuffIt Deluxe or StuffIt Standard can upgrade for
$29.99. The upgrade offer is good till March 31, 2006. To upgrade visit:
http://www.allume.com/store/upgrades.html

Systems Requirements: StuffIt Deluxe 10 requires Mac OS 10.3 or higher. The
Spotlight Importer and Automator scripting tool requires Mac OS 10.4.

To learn more about StuffIt and our product lines visit: www.stuffit.com,
www.allume.com, or www.smithmicro.com

About Smith Micro Software:

Smith Micro Software, Inc., headquartered in Aliso Viejo, CA, is a
developer and marketer of wireless communication, broadband and utility
software products for multiple OS platforms. The company designs integrated
cross platform, easy-to-use software for personal computing and business
solutions around the world. With a focus on Wireless and Broadband
technologies and the Internet, the company's products and services enable
wireless communications, file compression, eCommerce, eBusiness, Internet
communications (voice-over-IP), video conferencing, network fax, and
traditional computer telephony. Allume Systems, Inc., a division of Smith
Micro, develops and publishes award-winning software solutions for Windows
and Macintosh. Leading brands are StuffIt, Internet Cleanup and Spring
Cleaning. Allume's software offers a range of solutions, empowering users
in the areas of information access, removal, recovery, security, and
Internet distribution. Smith Micro's and Allume's complete line of products
are available primarily online at the company's websites, through our
enterprise direct sales efforts, retailers, and through original equipment
manufacturers (OEMs). Smith Micro's common stock trades on The Nasdaq Stock
Market under the symbol SMSI. For more information, contact Smith Micro at
(949) 362-5800 or visit the company's Web site at www.smithmicro.com.