What's new in 4.5:

*) fixed Nstreme issues with bridged traffic
*) ipsec - added blowfish, twofish, and camellia encryption algorithms;
*) fixed static route removing;
*) fixed DHCP client compatibility with some DHCP servers;
*) added static multi-cast route support;
*) fixed temperature monitor on RB800 and RB450G;
*) user manager - payment bug fix - now able to buy 
   credits without extend price specified;

What's new in 4.4:

*) snmp - fixed snmp version three;
*) snmp - fixed vlan interface speed;
*) hotspot - fixed radius variables in hotspot html pages;
*) removed support for xen;
*) routing - added support for BFD protocol;
*) fixed problem - MetaROUTER sometimes froze on RB4xx;
*) fixed OSPFv3 on bridge interfaces;

What's new in 4.3:

*) kvm - vnc support, booting from cdrom image
*) API - fixed possible crash when running concurrent commands;
*) console - fixed logging commands: 'warning', 'error' and 'debug' were
    all using 'info' topic;
*) bgp - added routing-table configuration option for instances;
*) bgp - added 'as-override' and 'passive' configuration options for peers;
*) bgp - added support for Site of Origin extended communities;
*) bgp - fixed some network issues;
*) ospf - fixed problem: when last neighbor on multi-access interface disappeared,
   incorrect RouterLSA was generated on designated router;
*) metarouter - allow to specify metarouter's memory size when importing image;
*) firewall - added 'routing-table' matcher;
*) fixed problem - e1000 driver did not work in virtual machines;

What's new in 4.2:

*) fixed problem - RB450G ethernet did not work if one of the ports was disabled;
*) fixed ethernet of RB433 with switch chip IP175D;
*) fixed route attribute problem;
*) fixed route next-hops falling under multiple connected routes;

What's new in 4.1:

*) fixed problem - RB750 (clocked at 300MHz) Ethernet did not work;
*) fixed problem - routes on some interfaces (like VLAN) were not activated;
*) ppp, gps, sms, serial terminal - allow use of different channels
    on same port across multiple programs simultaneous
*) dhcp server - added support for dynamic address-list entries;
*) hotspot - added support for dynamic address-list entries;
*) hotspot - fixed redirect after login in case if client gets new IP address
   (problem introduced in 3.28);

What's new in 4.0:

*) IT87XX hardware monitoring sensor support;
*) kvm allows to choose emulated nic model;
*) hotspot - fixed redirect after login in case if client gets new IP address
   (problem introduced in 3.28);
*) hotspot - fixed redirect after login in case if client gets new IP address;
*) console - commands like 'monitor', 'torch' and others that periodically
    refresh information sometimes failed to work when started from
    the scheduler;
*) console - scheduled scripts no longer require 'test' policy to run;
*) console - fix issues with scripts that contain lines with trailing spaces;
*) console - add back compatibility with old scripts that use space instead
    of '=' to separate argument name and value;
*) console - following fixes:
    - accept item numbers when prompted by command to specify item;
    - argument names without '=' were matched even when expecting unnamed
        value; this broke code such as:
           :foreach i in=1,2,3 do {}
       here 'i' was matched as argument name "in";
    - 'tab' key did not automatically append '=' after complete argument
        names;    

What's new in 4.0rc1:

*) console - removed support for Lua (will be reintroduced later);
*) incorporated all the bug fixes since v3.30;
*) port remote-access - added 'log-file' property. If value is a non-empty
    string, then all data that is read from the port is appended to a file
    with that name, regardless of the active remote connection;
*) console - removed '/user' from the output of top level '/export' command,
    still can be exported by '/user export';

What's new in 4.0beta4:

*) routing - changed BGP network and default-originate behavior;
*) web proxy - allow to edit error page;
*) console - terminal window size change now does not trigger full terminal
   reset;
*) mesh protocol - improved loop prevention (becomes incompatible with earlier versions);

*) incorporated all the bug fixes since v3.27;

What's new in 4.0beta3:

*) added support for 802.11n atheros based wireless cards;
*) added ability to run other OSs in MetaROUTERs;
*) console: Lua scripting language. http://wiki.mikrotik.com/wiki/Lua
*) console: added nstreme-dual OIDs;
*) incorporated all the bug fixes since v3.23;

What's new in 4.0beta2:

*) console: added 'without-paging' argument to 'monitor' commands;
*) console: now 'without-paging' and 'interval' arguments in of 'print'
    commands work together. Printing can be stopped by pressing 'q' or
    ctrl-c, any other key triggers printing;
*) incorporated all the bug fixes since v3.22;
*) fixed TFTP server logging;
*) fixed problem - "/system upgrade" did not show proper package
   architecture and was unable to fetch new packages;

What's new in 4.0beta1:

*) added support for MetaROUTERs;
*) all test packages are regular ones;
*) console - can mix named and unnamed arguments, can use names for unnamed
     argument values. For example all of the following commands are
     accepted now:
       /ping 10.11.12.13 count=4
       /ping address=10.11.12.13 count=4
       /ping count=4 10.11.12.13