AntiVirus, AntiSpyware, AntiSpam Products for|
» MailScan » MailScan
for MS Exchange Server 2000/2003/2007|
| ||MailScan for Microsoft Exchange
VSAPI Mode|| |
If Microsoft Exchange 2000/2003/2007 is already installed, then MailScan for
Exchange Server 2000/2003/2007 will scan the viruses via Microsoft Virus Scanning
API (VS API).
What is and why use VS API (Virus Scanning API)?
Exchange 2000/2003/2007 provides a new virus scan API that is implemented
at the lowest level in the Exchange store. This allows a virus scanning application
to run with high performance and guarantees that the message will be scanned before
any client can access a message or attachment.
In addition, VSAPI reduces
scalability issues that can arise when a particular server has a large number
of users/mailboxes. VSAPI's real-time scan allows messages and attachments to
be scanned once before delivery, rather than multiple times determined by the
number of mailboxes the message is delivered to. This single-instance scanning
also helps prevent messages from being rescanned when a message is copied. MailScan
for Exchange Server 2000/2003/2007 has the following features:
- Content Scanning.
- Proactive scanning.
- Multithreaded queue processing.
- Per-Messaging Database
- Enhanced background scanning.
- Virus scanning
API-specific Performance Monitor counters.
Advantages of using VSAPI Layer
Microsoft strongly encourages
the development and adoption of Exchange VS API-based anti-virus solutions
- VSAPI is secure and preserves the integrity of the Information Store and its
- The Microsoft Exchange product group is committed to providing
enhancements to this API, bug fixes, documentation, and technical assistance to
ISVs using VSAPI (as appropriate).
- Antivirus solutions using Extensible
Storage Engine API or any other undocumented API may corrupt the Information Store
and its databases.
- The Microsoft Exchange product group does not provide
any code updates, documentation, or technical assistance to address issues related
to the use of a non-VSAPI-based solution.
- For Exchange customers using
a non-VSAPI-based solution, Microsoft Product Support Services may ask the customer
to uninstall/disable the anti-virus solution to help identify issues, this may
delay in final resolution.
- VSAPI enhances the current core feature set
by providing abilities to optimize and configure the scanning process at multiple
levels, as well as providing Exchange administrators with built-in functionality
to monitor the performance of the new API.
Limitation of using
Since the VSAPI interface guarantees that emails cannot be accessed
until scanned, on-demand scanning could cause some access delay. This delay is
normally not noticeable, but in very high load conditions, it is possible that
some applications exhibit some timeout failures.
VSAPI scanners operate
on individual parts that are attachment and bodies.
using VSAPI 2.5.0
VSAPI 2.5 provides more information on the email sender
and recipients over VSAPI 2.0 and VSAPI 2.5 has the capability of gateway level
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