Im Folgenden Auszüge aus den amerikanischen Texten. Im orignal Wortlaut, lediglich gekürzt um einigen Fülltext.

Mails
WL2K supports a clean simple interface to the Internet SMTP
e-mail system
The radio user's email address must be known to the system as a radio user or the message will be rejected.

Bulletins-Catalog
WL2K uses an "on-demand" bulletin distribution mechanism.
Users must first select requested bulletins from an available "catalog" list managed in Airmail. When bulletin requests are received by a PMBO, a fresh locally cached copy of the requested bulletin is delivered. If no freshly local cached version is available, the PMBO accesses the Internet and finds the bulletin which is then downloaded to the PMBO and then sent to the user.
All WL2K PMBOs support a single Global catalog.
Users can access any bulletin from any PMBO.
The system prevents bulletin duplication and automatically purges obsolete time-sensitive weather bulletins and replaces them with the current version.

WEB-access
By any access to a WEB browser, an amateur can read any of his pending messages or originate new ones.
The WEB Browser Access is limited to text-based messages without the use of bulletins or file attachments. Of course, WEB Browser access to messages is password protected.

Airmail provides a super-fast replica of WL2K radio operations while directly connected through the Internet to one of the participating network station PMBO-Telnet-Servers.
This method of obtaining messages over the Internet allows multiple attachments, catalog bulletins, and all other Winlink 2000 services normally available over radio channels.
In order to use this service, a user must currently be listed as a radio user.
Both Telpac, Paclink and Airmail support the Telnet client service to over 25 Winlink 2000 Telnet servers.

The Winlink 2000 messaging system uses the SMTP email format for both messages to the Internet and messages to other radio users. However, in certain circumstances, only the call is needed for a Winlink 2000 radio user to email another radio user.
Messages addressed to calls not known to the WL2K system are not accepted.

Limited in size
Email message attachments sent through the Winlink 2000 system must be limited in size.

A user may also turn off the ability to receive file attachments.
Certain file attachment types are blocked from the system for the protection of the user from virus attacks.

90-days-PMBO
Winlink 2000 (WL2K) uses a message routing system that makes note of which Winlink PMBO stations a user has connected over the past 90 days.
Whenever a message is received for a user, it is forwarded to these specific PMBOs.
When the message is read at any one of these PMBOs, a notice is automatically sent to the others indicating that the message was delivered, thereby, allowing it to be removed from the system. When a user stops using any specific PMBO for 90 days, messages will no longer be sent to that specific PMBO.

If a PMBO is used for the first time, the system makes note of it and forwards all pending messages to that PMBO. The next time the user connects to that PMBO, all of his pending messages will be there.

Users become known to the system simply by connecting to any WL2K PMBO.

Interactive keyboard commands
There is a terminal mode for interactive keyboard commands, allowing a terminal rather than computer-based software to connect to a PMBO.
This method discouraged, but may be used for the listing and deletion of messages only.
On HF radio, the client of choice is the Airmail program written and supported by Jim Corenman, KE6RK.

Requirements for individual participating PMBOs
The WL2K system will support an optimal number of individual participating PMBOs. The only requirements are an up-to-date PC, access to Internet via a full-time connection, and Pactor (packet optional) radio facilities. (Pactor is used on HF, AX.25 packet on VHF/UHF, and both employ the B2F compressed binary format.

PACTOR I, II, III
Some of the Winlink 2000 participating network stations (PMBOs) restrict their protocols to Pactor II (400 to 800 bps) and Pactor III (1400 to 3600 bps.)
There are PMBOs that also receive the slower Pactor I (100 to 200 bps) protocol.
Utilization of the Pactor II and Pactor III protocols allow the user up to 18 times the volume of messages over that of Pactor I for the same period of time.
On average, this translates to a Pactor 1 station downloading an 80,000 byte file in approximately 80 minutes while on Pactor 3, the same download takes approximately 6 minutes.

Position reporting
WL2K also provides rapid position reporting from anywhere in the World.
This facility is interconnected with the APRS, ShipTrak, and YotReps networks.
It supports weather reporting from cruising yachts at sea and an interconnection with the YotReps network which is used by government forecasters for weather observations in parts of the world where no others are available. It also allows the maritime user to participate in the National Weather Service's NOAA MAROB a voluntary marine observation reporting program.

Time limit
The time limit is individual to each PMBO station.
The default time per any 24 hour period is 30 minutes, however, the user may request more time from the PMBO sysop.

Systemüberwachung
Extensive traffic reports are collected.
The state of individual PMBOs is monitored and reported if it become inactive.
Daily backups are performed automatically at all PMBOs as well as the Central Server (CMBO) to insure the system integrity.
Security is insured through the vigorous updating of virus definitions and automatic virus screening for all Internet mail and files.
The system has the ability to block any user by both radio (by frequency band) and Internet (by email address) to prevent abuse of the system.