To better determine performance, I shut down unnecessary services (e.g., file sharing) on my host machine during testing. To establish a baseline, I sent out my 4303 messages without using any antivirus software; Microsoft Exchange Server delivered all the messages in 27 minutes. I then installed each product, sent my test messages, then repeated the test and recorded the best delivery time out of the two passes. I also ran an additional test on Sybari Antigen for Microsoft Exchange, changing its bias to Favor Certainty, which gives more importance to accuracy over performance. I used the Exchange Message Tracking logs to determine delivery times. Your production servers will probably see much smaller performance differences than I did in my test environment, which ran the products on virtual machines.
Table A: Performance
| | CA eTrust Antivirus Exchange Option* | McAfee Active Mail Protection | Symantec Mail Security | Sybari Antigen (defaults**) | Trend Micro ScanMail Suite | |
| Time to deliver all messages | 1 hour, 21 minutes | 4 hours, 13 minutes | 2 hours, 31 minutes | 4 hours, 29 minutes**;
5 hours, 20 minutes*** | 35 minutes |
* Using InoculateIT
** Using normal bias (at least two engines)
*** Using Favor Certainty bias (two to three engines)