On April 22, 2005 at approximately 3:30 pm Pacific (11:30pm GMT) Trend Micro posted a pattern file (2.594.00) which had the potential to interact with certain computing configurations and cause computer performance issues for some users of PC-cillin, OfficeScan (including the OfficeScan component of Client/Server Suite for SMB, and Client/Server/Messaging Suite for SMB), and ServerProtect for NT. This specific pattern file was only available during an approximately 90-minute time window. Trend Micro removed the pattern file from our Web sites and Active Update servers at 5:02 pm (1:02am GMT), and immediately took steps to post a new pattern file. Subsequent pattern files do not cause these issues.

For any customers experiencing instability, Trend Micro has provided a set of solutions which can be found under the Support section of Trend Micro?s Web site. Additionally, Trend Micro has extended support hours especially to help those customers who were affected by this issue. Further information, instructions, and details can also be found on the Trend Micro Web site at: http://www.trendmicro.com/pattern594