...
RouterOSv7 provides with new and redesigned implementation of User Manager, configuration now is integrated into RouterOS WinBox and console, more information is available here. Direct migration from older User Manager is not possible, it is possible to migrate older database from /user-manager/database/migrate-legacy-db However it might be a good idea to start configuration for the scratch.
New features
New Kernel is implemented in RouterOSv7, that lead to performance changes due to route cache, as well some tasks might require higher CPU and RAM usage for different processes.
!) completely new NTP client and server implementation;
!) merged individual packages, only bundle and a few extra packages remain;
!) new Command Line Interface (CLI) style (RouterOS v6 commands are still supported);
!) support for Let's Encrypt certificate generation;
!) support for REST API;
!) support for UEFI boot mode on x86;!) CHR FastPath support for "vmxnet3" and "virtio-net" drivers;
!) support for "Cake" and "FQ_Codel" type queues;
!) support for IPv6 NAT;
!) support for Layer 3 hardware acceleration on all CRS3xx devices;
!) support for MBIM driver with basic functionality support for all modems with MBIM mode;
!) support for MLAG on CRS3xx devices;
!) support for VRRP grouping and connection tracking data synchronization between nodes;
!) support for Virtual eXtensible Local Area Network (VXLAN);!) support for L2TPv3;
!) support for OpenVPN UDP transport protocol;
!) support for WireGuard;
!) support for ZeroTier on ARM and ARM64 devices;
!) completely new alternative wireless package "wifiwave2" with 802.11ac Wave2, WPA3 and 802.11w management frame protection support (requires ARM CPU and 256MB RAM);
!) support for L3 Hardware offloading