Hi guys 
I'm searching for an anti-spam software for Microsoft Server Exchange (to use with Microsoft Outlook 2003). A free and efficient will do the job or if it needs to be paid for, we have a very small budget (like 200-300$ CAD for 25 or so computers).
Thanks for you help
P.S : 22 WinXP and 3 WinVista.
P.S2 : NOT POP3!

I'm searching for an anti-spam software for Microsoft Server Exchange (to use with Microsoft Outlook 2003). A free and efficient will do the job or if it needs to be paid for, we have a very small budget (like 200-300$ CAD for 25 or so computers).
Thanks for you help
P.S : 22 WinXP and 3 WinVista.
P.S2 : NOT POP3!
My Computer
- Computer type
- PC/Desktop
- Computer Manufacturer/Model Number
- Custom build
- OS
- Windows 10 Professional 64-bit
- CPU
- Ryzen 9 5900X
- Motherboard
- Gigabyte X570 Aorus Master
- Memory
- G.Skill 3600Mhz CL16 16GB × 4
- Graphics Card(s)
- EVGA GeForce RTX 3070 Ti FTW3 Ultra Gaming
- Sound Card
- On-board
- Monitor(s) Displays
- Dell Alienware AW3418DW
- Screen Resolution
- 3440x1440
- Hard Drives
- 1×Sabrent Rocket 4 Plus 2TB nvme SSD (System, internal)
2x4TB Western Digital Blue (Internal)
1x4TB HDST 7200RPM (Internal)
- PSU
- Seasonic Focus Plus 850W Platinum
- Case
- Corsair 680X
- Cooling
- Stock fans + 3× Corsair QL120, Corsair H100i Platinum
- Keyboard
- Logitech K350
- Mouse
- Logitech M510
- Internet Speed
- 120Mbits dl - 20Mbits up
- Antivirus
- ESET NOD32 Antivirus
- Browser
- Firefox (latest version)
- Other Info
- Headphones : Audio-Technica ATH-M50x
Scanner : Canon Canoscan LiDE 220 + Plustek OptiBook 4800