The minimum hardware configuration recommended for Kerio MailServer (basic license for 20 users):
CPU 1 GHz
512 MB RAM
50 MB free disk space (for the installation)
40 GB free disk space for user mailboxes and backups
For maximum protection of the installed product (particularly its configuration files), it is recommended to use the NTFS file system.
Recommended hardware configuration of the computer where Kerio MailServer will be running:
For 20 — 100 active users
CPU 2 GHz
1 GB RAM
160 GB free disk space for user mailboxes and backups
For 100 and more active users
CPU 2.8 GHz Dual Core
2 GB RAM
200 GB and more free disk space for user mailboxes and backups
Notes:
An active user is a user that uses the Kerio MailServer services multiple times a day (e.g. mail services, calendar, tasks, etc.).
These recommendations apply only in case the computer is used only as a mailserver (Kerio MailServer, antivirus, anti-spam).
Kerio MailServer is supported on 32-bit operating systems.